Holatron RFLS-MK3HSXT Operating manual

OPERATION & MAINTENANCE GUIDE -
Acoustic Triggered High Speed UHF Transmitter
HOLATRON SYSTEMS, LLC
833 ILANIWAI ST, STE. 2
Honolulu, HI 9681 3
(808) 372 - 0956
www.holatron.com

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WARNING
Holatron Systems specializes in the design and manufacture o f standard and custom electronic
control systems where reliability and error free data communication are critical. The transmitter
described in this manual is part of a system intended to remotely actuate pyrotechnic or other
hazardous devices, and the com ponents of this system have been carefully designed to
minimize the possibility of accidental actuation of such devices. Holatron’s design goal is to
ensure that data communication errors due to radio interference or to insufficient signal strength
due to low battery, exceeding specified range, or conductive objects in the signal path will result
in failure of intentional actuation rather than unintended actuation. Techniques used to achieve
this design goal are described in section 1. 9 . Though the probabil ity of unintended actuation is
extremely small, it cannot be guaranteed to be zero. Therefore, it is important that the user
not enable the receiver until all persons who might be harmed by accidental actuation
are in a safe area .
As a condition of purcha se, the user must acknowledge awareness and agreement that
utilization of this product and participation in activities utilizing fireworks, rockets, and explosives
is an ultra - hazardous activity carrying implied and explicit risks of injuries and damages t o the
user and to other participants. The user assumes the risk connected with the utilization of this
product and all risks of participation in the activities for which this product is sold. User
acknowledges that he/she/it has the necessary and required skill, expertise, training and
licensing, as may be applicable or necessary by custom, usage, trade or law, to engage and
participate in the ultra - hazardous activities connected with the use, purchase, transportation, or
employment of the products sold un der this agreement. User acknowledges that Holatron
Systems, LLC, has not and will not conduct any investigation into the skill, expertise, training
and licensing, as may be applicable or necessary by custom, usage, trade or law, of the user or
of user’s a gents, employees and assigns, to engage and participate in the ultra - hazardous
activities connected with the use, purchase, transportation, or employment of this product. User
specifically agrees that Holatron Systems, LLC, its officers, employees, and age nts shall not be
liable for any claim, demand, cause of action of any kind whatsoever for, or on account of death,
personal injury, property damage or loss of any kind resulting from or related to user’s or user’s
employees’, agents’ or assigns’ use of thi s product, and user agrees to indemnify, defend in any
action at law, and hold harmless Holatron Systems, LLC, from same, whether brought by the
user, user’s agent, or assigns, or any third party.
Usage of this transmitter is authorized under FCC Rules an d Regulations as listed in CFR 47
Ch.1 (10 -1- 96 Edition), p art 15, subpart C, sections 15.209 and 15.231. This equipment has
been tested and assigned FCC ID number: OI4RFLS1XT.
Any changes or modifications to the hardware not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.

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This manual is divided into two sections. The first is a description of the system hardware. The
second covers the recommended operating and maintenance pro cedure.
1.0 HARDWARE DESCRIPTION.
The model RFLS - MK3 HS XT Fixed Channel High Speed UHF Transmitter with
sequential acoustic trigger is a low power six channel, safety locking, hand - held remote
control transmitter which can transmit commands over any of six different digital
channels. The transmitter’s channel setting is fixed in software and cannot be changed.
A label displaying the channel setting is affixed to the top of the transmitter next to the
antenna. Transmitters fixed to separate digital channel nu mbers can transmit
simultaneously without interfering with each other. This permits up to six different
receivers or groups of receivers to be controlled by separate transmitters
simultaneously. The transmitter will only actuate receivers whose digital cha nnel
switches are set to select the same channel as the transmitter. Thus, multiple
transmitters may be used to actuate different selected receivers even though all operate
on the same frequency. Transmitters fixed to the same digital channel number will
i nterfere with each other and result in failure - to - fire when actuated simultaneously.
When used with RFLS - 96 HS RC , RFLS - 496 HS RC , or RFLS -9 12HS RC receivers, a
range of ½ mile can be achieved. All inscriptions on the transmitter panel are
luminescent to faci litate use of the transmitter in a dark environment. The panel will
continue to glow for two to three hours after being exposed to a bright light source. The
transmitter’s two commands are digitally encoded and amplitude modulated on a single
carrier frequ ency of 418 MHz (or optionally 433.96 MHz) . This frequency is controlled by
a SAW (surface acoustic wave) device for exceptional stability. No alignment or tuning
procedures are ever required to maintain optimum performance. The command signal is
transmit ted by amplitude modulating the carrier to indicate to the receiver which of the
transmit buttons is depressed or whether an acoustic event has been detected.
In acoustic trigger mode ( digital switch positions 0 – B ), the “A command” signal (semi -
automati c fire) is transmitted for 250 msec when an acoustic impulse exceeding the
selected threshold is detected by the rear panel microphone while the “ Fire A / Enable B ”
button is depressed, and it is transmitted continuously while the “B” button and “A”
button are depr essed simultaneously, permitting the “B” button to serve as an acoustic
event simulator.
In normal command mode ( digital switch positions C – F ), t he modulated RF output
occurs continuously while either of the two transmit buttons is depressed . Resulting
receiver output is continuous while the “A command” signal (semi - automatic fire) is being
transmitted, and the receiver fires outputs in rapid - fire mode at a rate selected by the
transmitter’s FIRE RATE SELECTION SWITCH while the “B command” signal is bein g
transmitted.

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The user has access to the following components:
1.1 THE ANTENNA.
The RF signal is radiated by a quarter - wave flexible whip antenna which screws
onto the top end of the transmitter box. The transmitter should never be
operated without this a ntenna in place, as damage to the RF components
could result. Such operation will void the warranty.
Antennas with red rings are used for 433 MHz, and antennas with blue rings are
used for 418 MHz. Be careful not to overtighten the antenna when screwing it on,
as this could cause its mating connector to rotate and break its internal
connection. Rotation could also occur, with the same result, when subsequent
removal of an overtightened antenna is attempted. The recommended way to
install the antenna is to grasp it by its small diameter upper part and rotate gently
in a clockwise direction until increased resistance is felt. It need not be tight to
achieve a good electrical connection. When removing the antenna for storage,
observe the base of the mating con nector to ensure that it is not rotating. If the
antenna is so tight that rotation is occurring, grasp the hex base of the mating
connector with long nose pliers, and then unscrew the antenna.
1.2 THE SAFETY LOCKING SWITCH.
The Safety Locking Switch is a min iature keylock with two positions, “Safe” and
“Xmtr Enabled”. In the “Safe” position no RF output occurs even if a button is
pressed. In the “Xmtr Enabled” position modulated RF output occurs
continuously while a button is pressed. Whether transmitting or not, a green
warning indicator near the switch flashes whenever the switch is in its “Enabled”
position and the battery voltage is above the low battery detect threshold.
Approximately 1 milliamp is drained continuously from the battery while the
transmitt er is enabled and not transmitting. So this switch should always be
turned to the “Safe” position while the transmitter is not being used. Keys are
interchangeable, as all Holatron RFLS - 6HS XT transmitters are keyed the same.
Firing on all receivers set to the transmitter’s digital channel always commences
at cue 1 after the transmitter has first been enabled. Thus all receivers on this
transmitter’s fixed channel can be reset to cue 1 at any time by turning this switch
momentarily to “Safe” and then back t o “Transmitter Enabled”.

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1.3 THE “XMTR ENABLED” INDICATOR.
This green lamp, located at the “Enabled” position of the lockswitch, warns the
user that transmission will occur when a button is pressed or an acoustic event is
sensed, and that battery drain is occurring. It also verifies that battery voltage is
adequate to transmit a signal over the specified range.
When the transmitter is turned on (transmitter enabled) with the keylock switch,
battery status is indicated by the flashing of this lamp. It is of sufficiently high
intensity to be visible in direct sunlight and will flash intermittently in bursts of
one, two, or three flashes at a time if the battery has enough capacity to power
the transmitter. If no flashing occurs, the battery must be replaced b efore the
transmitter can be used reliably. Three flashes per burst indicate that the battery
has full capacity, two flashes indicate that its capacity is beginning to diminish,
and one flash indicates that it is near the end of its useful lifetime in whic h case it
should be replaced immediately after the current use. Adequate transmitter
output to achieve the specified range will occur as long as the battery voltage is
above approximately 7.0 volts, but the battery voltage will drop rapidly at this
point.
If in acoustic trigger mode (digital switch positions 0 – B), this indicator will glow
continuously while the “ Fire A / Enable B ” button is pressed. Only while glowing
continuously can command transmission occur in response to an acoustic event
or a “Fire B” butto n press.
1.4 THE FIRE BUTTONS.
These buttons are snap action dome switches under a sealed overlay, labeled
“Fire A” and “Fire B”, respectively. They have a high spring constant which
requires a firm depression for actuation, decreasing the likelihood of acci dental
depression. The enabled transmitter can be kept in a shirt or jacket pocket
without fear of accidental button depression. The action of the buttons depends
on the position of the transmitter’s digital switch.
1.4.1 Acoustic Trigger Mode (digital switch p ositions 0 – B)
For safety, transmission is enabled only while the “ Fire A / Enable B ”
button is depressed . Be aware that fire command transmission can
occur immediately upon depression of the “ Fire A / Enable B ” button
if acoustic events are occurring. Do not press the “ Fire A / Enable B ”
button until it is quiet, and all persons who might be harmed by
device actuation are in a safe area. W hile “ Fire A / Enable B ” is
depressed, the green “Xmtr Enabled” indicator will glow continuously, and
“A command” (semi - automatic fire) trans mission will occur while an
acoustic event is being detected by the rear - panel microphone. Each
detected acoustic event will result in the firing of the next sequential
receiver output. Transmission will occur for 250 msec following an
acoustic event, and maximum sense rate is approximately 3 events per
second. An acoustic event is defined as a sound impulse exceeding the
switch selected threshold. (See section 1.7)

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If the “Fire B” button is pressed while “ Fire A / Enable B ” is also pressed,
the “A command” is transmi tted, resulting in the firing of the next
sequential receiver output. The output remains on until at least one of the
buttons is released.
1.4.2 Normal Command Mode (digital switch positions C – F)
In this mode the transmitter is idle while no buttons are pres sed.
Continuous transmission occurs while “ Fire A” or “Fire B” is pressed.
Output firing pulses are stretched to a minimum duration of 0.6 seconds
in the receivers to ensure that cues fire reliably, even when the fire
buttons are pressed for a shorter peri od of time. Note that it is not
necessary to wait for the completion of the 0.6 second firing pulse period
before firing subsequent cues. They can be fired as fast as the operator
can press the button, provided that each button depression lasts at least
0. 1 second, followed by at least 0.1 second with the button released. If
many transmitters are transmitting simultaneously, it may be necessary to
depress a fire button slightly longer than 0.2 second in order to ensure an
output from the receiver .
1.5 THE TRANSMIT INDICATOR.
This is a high intensity red indicator, visible in direct sunlight, that lights
continuously while the transmitter is generating RF output. It is located between
the two buttons. It will light even if the battery voltage is below the low b attery
detect threshold. It can be used to check microphone sensitivity by indicating
acoustic event detection in acoustic mode with the receiver(s) switched off. “ Fire
A / Enable B ” must be depressed while conduct ing this check . Adequate
m icrophone sensitivity can be verified by observing a red flash each time an
even t is detected. This is a useful tool for setting microphone sensitivity with the
digital switch. (See section 1.7)
1.6 THE BATTERY.
Power is supplied from an alkaline 9 volt battery, accessible beneath a slide - out
door on the back side of the transmitter. T his battery should be replaced when
required by conditions described in section 1.3 above. In order to prevent the
possibility of damage due to battery leakage, the battery should always be
removed if the transmitter is to be stored for a prolonged period. Damage due to
battery leakage is not covered under the warranty.

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1.7 THE DIGITAL SWITCH.
A 16 position miniature rotary switch is accessible through a hole in the back of
the transmitter. The switch is located on the left edge of the internal printed circ uit
board, as shown in the following photo. It can be set to digital channels 0 – 9 or
A – F by rotation with a small screwdriver. The setting, or position, of this switch
sets the transmitter operating mode and the acoustic event detection threshold
as shown in the following table. Positions 0 – B select acoustic trigger mode, with
higher switch settings corresponding to higher thresholds and lower acoustic
sensitivity. Positions C – F select normal command mode (buttons only) with the
switch setting se lecting the automatic fire rate for depressions of the “Fire B”
button . Holatron Systems can supply custom fire rates if required.
NOTE: Automatic firing always commences at the next cue after the last one
fired, whether it was semi - automatic or automatic . Semi - automatic firing
always commences at the next cue after the last semi - automatic cue
fired, even if automatic cues have been fired in the meantime.
Semi - automatic or automatic firing always commences at cue 1 after the
transmitter has first been ena bled. Thus all receivers on the transmitter’s
fixed channel can be reset to cue 1 at any time by turning the
transmitter’s safety locking switch momentarily to “Safe” and then back to
“Transmitter Enabled”.
(Transmitter with rear c over removed)
Digital Switch
Microphone

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The access hole for the digital switch enables the operator to view the switch
setting and insert a small screwdriver to change it without having to remove the
rear cover.
( Tr ansmitter back shown without and with adhesive disc in place. )
An adhesive disc normally covers the access hole for the digital switch to keep
out contaminants and conductive objects. The disc can be peeled back when it is
necessary to view or change the switch setting.
Digital Switch
Access Hole
Access Hole Covered
with Adhesive Disc
Microphone
Hole
Battery Access Door

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Xmtr Digital
Switch Setting “Fire A / Enable B” Action “Fire B” Action
0
Enables transmission of a semi -
automatic fire command upon
detection of acoustic event or upon
“Fire B” button depression. Minimum
acoustic threshold (max imum
acoustic sensitivity).
If “Fire A” button is also pressed,
xmts a semi - automatic (single - shot)
fire command continuously until
one or both button s are released.
1
Same as above with higher acoustic
threshold.
Same as above .
2
Same as above with hi gher acoustic
threshold.
Same as above.
3
Same as above with higher acoustic
threshold.
Same as above.
4
Same as above with higher acoustic
threshold.
Same as above.
5
Same as above with higher acoustic
threshold.
Same as above.
6
Same as above wit h higher acoustic
threshold.
Same as above.
7
Same as above with higher acoustic
threshold.
Same as above.
8
Same as above with higher acoustic
threshold.
Same as above.
9
Same as above with higher acoustic
threshold.
Same as above.
A
Same as above with higher acoustic
threshold.
Same as above.
B
Same as above with highest acoustic
threshold (minimum acoustic
sensitivity).
Same as above.
C
Semi - automatic firing.
(Single shot, sequential)
Automatic firing (rapid fire) at a rate
of 7.69 shots / s econd while the
button is pressed. (0.13 second per
shot)
D
Semi - automatic firing.
(Single shot, sequential)
Automatic firing as above at a rate
of 10 shots / second. (0.1 second
per shot)
E
Semi - automatic firing.
(Single shot, sequential)
Automatic fi ring as above at a rate
of 14.3 shots / second. (0.07
second per shot)
F
Semi - automatic firing.
(Single shot, sequential)
Automatic firing as above at a rate
of 20 shots / second. (0.05 second
per shot)

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1.8 REMOTE FIRE JACK.
Transmitters that include this optional feature can be actuated remotely through a
two conductor shielded cable plugged into a jack located on the left side of the
transmitter box. The jack accepts a standard 1/8” miniature stereo phone plug .
The cable’s shield connects to the plu g’s “shell”, the red lead to the plug’s “tip”,
and the black lead to the plug’s “ring”.
The transmitter is actuated remotely by connecting the tip to the shell (red to
shield) to duplicate the action of the “ FIRE A ” button, and by connecting the ring
to t he shell (black to shield) to duplicate the action of the “ FIRE B ” button. The
transmitter’s FIRE buttons also remain operational while the cable is plugged in.
NOTE: T he transmitter should always be turned off when plugging in or
extracting the remote cable to ensure that no fire commands are
accidentally transmitted if jack contacts should be momentarily shorted
during the insertion or extraction .
1.9 RADIO INTERFERENCE REDUCTION.
For obvious safety reasons, Holatron's design goal is to ensure that data
c ommunication errors due to radio interference or to insufficient signal strength
due to low battery, e xceeding specified range, or conductive objects in the signal
path will result in failure of intentional actuation rather than unintended actuation.
This goal is achieved by transmitting a 64 bit noise - tolerant code repeatedly while
a transmitter button is depressed. 6 0 of these bits must match the pattern
expected by the receiver . Thus, there is one chance in (2 to the 60
th
power) of an
actuation occurring due to reception of a random signal. Expressed in decimal
numbers, this is ( 1.1529 times 10 to the 18
st
power, or 11529 followed by 14
zeroes). This is a probability of 8.6736 times 10 to the - 19
th
power ( or a decimal
point followed by 18 zeroes followed by 86736 ). Though th is probability of
unintended actuation is extremely small, it cannot be guaranteed to be zero.
Therefore , it is important that the user not arm the receiver until all persons
who might be harmed by accidental actuation are in a safe are a.
Additional protection is offered by use of 418 MHz as the operating frequency.
This frequency is sparsely used only by low power transmitters with a maximum
range of approximately 100 yards. It is not commonly used by auto security
systems, garage door openers, radio control models, cordless or cellular
telephones, wireless microphones, or two way communications equipment.
Because this system operates in the UHF region, interference from lamp
dimmers, electrical discharges, and other natural sources is also minimal.
No instances of false triggering with this communications technology have been
reported to date.

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1.10 SPECIFICATIONS.
Parameter Minimum Typical Maximum
Carrier Frequency, MHz. 417.96 418.02 418.08
Carrier Frequency, MHz. (optional) 432.9 0 43 3. 96 43 4 .0 2
Range (line - of - sight with RFLS -96RC
- 49 6 RC r eceiver s)
½ mile
Delay from start of button depression
to receiver output (fewer than 4
transmitters transmitting
simultaneously)
50 msec 75 msec
Delay from start of button depression
to receive r output (more than 3
transmitters transmitting
simultaneously)
100 msec 400 msec
Button depression time per cue (fewer
than 4 transmitters transmitting
simultaneously)
100 msec
Button depression time per cue (more
than 3 transmitters transmitting
sim ultaneously)
400 msec
Delay from acoustic event detection to
receiver output (fewer than 4
transmitters transmitting
simultaneously)
100 msec
Delay from acoustic event detection to
receiver output (more than 3
transmitters transmitting
simultaneously )
425 msec
Acoustic event transmission duration 250 msec
Processing rate, acoustic events / sec 3
Battery current, average, (enabled)
Battery current, average, (xmting)
1.0 mA
4.0 mA
Battery life (enabled, not transmitting) 500 hrs
Low Ba ttery Detect Threshold 7.7 V
Transmitter Supply Voltage 7.0 V
2.0 OPERATION AND MAINTENANCE.
This section describes the recommended operating procedure and maintenance for the
transmitter - receiver system.
2.1 OPERATION.
2.1.1 With the receiver turn ed off and its a rm switch set to “ disarm ” ( RFLS -
496 HS RC) or “safe” (RFLS - 96 HS RC & RFLS - 912HSRC ) , connect
devices to the receiver outputs.

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2.1.2 With the a rm switch still in the previous position, turn on the receiver.
Verify a flashing green battery indica tor on the receiver module . This
indicator will flash intermittently in bursts of one, two, or three flashes at a
time if the battery has enough capacity to power the receiver. If no
flashing occurs, the receiver cannot be used reliably. Three flashes per
burst indicate that the battery is fully charged, two flashes indicate that its
charge is beginning to diminish, and one flash indicates that it is near the
end of its useful charge, in which case it should be replaced immediately
after the current use.
2.1.3 E nable the transmitter, and with the receiver’s ARM switch in “safe” or
“disarmed” position , perform a range test by observing the green
activity light on the receiver while pressing a transmitter button . There
should be no intervening conductive objects f or most reliable operation.
All receivers must be elevated 12” or more above ground level to achieve
specified range. When transmitting over water , range will normally
exceed the specified value.
Range of the receiver is typically ½ mile, and its range c an be tested with
the arm switch off by observing the green activity indicator while the
transmitter FIRE buttons are pressed. Verify that the transmitter battery is
not depleted by observing the flashing “Xmtr Enabled” light while not
pressing the FIRE bu ttons . (See section 1.3) Then turn the transmitter
lock switch back to “Safe” position.
2.1.4 If operating in acoustic trigger mode, check acoustic sensitivity by
depressing “ Fire A / Enable B ” and observing the red transmit indicator’s
response to surrounding acoustic events. The transmitter should be held
in a vertical orientation with its rear panel facing the source of the desired
acoustic event. Set the digital switch to the highest acoustic threshold that
still provides reliable triggering, as indicated by the tran smit indicator.
Higher thresholds reduce the risk of unintended triggering from
background noise, and lower thresholds reduce the risk of failure - to -
trigger from the desired acoustic event. Note that the receiver must be
disarmed for this test, as transmis sion is occurring.
2.1.5 Verify electrical continuity through the devices connected to the receiver
outputs. Continuity is tested on the RFLS -96 HS RC and RFLS - 496 HS RC
receiver s by pressing the test button. On the RFLS - 912HSRC receiver, it
is done by pressi ng the ARM toggle switch down into its “Test” position.
Lighted lamps indicate open circuits. It is recommended this be done with
the Arm S witch in the “Safe” or “Disarmed” position, but the test circuit will
also function in the “Armed” position.

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2.1.6 When t he area around the devices to be actuated is clear of persons who
might be injured by an accidental actuation, and after verifying that the
receiver’s green activity light is off (no radio signal is being detected), turn
the receiver’s ARM switch to its “Armed” position. Refer to the receiver
manual for the corresponding arming procedure.
WARNING - If the receiver’s green activity light is erratic or on
continuously , its output may be actuated immediately upon
changing its ARM switch to the “Armed” posit ion .
2.1.7 If operating in Acoustic Trigger Mode (see section 1.4.1), turn the
transmitter lock switch to its “Enabled” position. The transmitter should be
held with the antenna in a vertical orientation, away from the body and
other conductive objects to achie ve maximum range and communication
reliability. Generally, the higher the transmitter is held, the greater the
range. Conductive objects such as chain - link fences, aluminum
bleachers, and automobiles in the transmission path will reduce the
range.
Be awar e that fire command transmission can occur immediately
upon depression of the “ Fire A / Enable B ” button if acoustic events
are occurring. Do not press the “ Fire A / Enable B ” button until it is
quiet, and all persons who might be harmed by device actuation are
in a safe ar ea.
When you are sure that background noise is below the acoustic trigger
threshold and all persons who might be harmed by device actuation are in
a safe area , press “ Fire A / Enable B ” and hold until occurrence of the
acoustic event. The green “Xmtr Enabled” indi cator will glow continuously,
and “fire command A ” transmission will occur when an acoustic event is
sensed by the rear - panel microphone or when the “Fire B” button is
pressed , resulting in one sequential shot for each event occurrence .
Transmission will o ccur for 250 msec following an acoustic event and
continually while the “Fire B” button is held down . An acoustic event is
defined as a sound impulse exceeding the switch selected threshold.
(See section 1.7)

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2.1. 8 If operating in Normal Command Mode (se e section 1.4.2), t urn the
transmitter lock switch to its “Enabled” position. Press the appropriate
button to actuate the desired receiver output channel. A button must be
depressed for at least 75 milliseconds to produce a receiver output. It is
never nec essary to hold a transmit button down longer than one
second , however. If no actuation has occurred in this period of time,
none will occur, no matter how much longer the transmit button is
depressed. The receiver may be attempting to actuate a short circu it , and
damage could result.
The transmitter should be held with the antenna in a vertical orientation,
away from the body and other conductive objects to achieve maximum
range and communication reliability. Generally, the higher the transmitter
is held, the greater the range. Conductive objects such as chain - link
fences , aluminum bleachers, and automobiles in the transmission path
will reduce the range.
2.1. 9 When finished, turn off the receiver, and turn the transmitter lockswitch
back to its “Safe” po sition to stop further drain of the transmitter battery.
You may remove the antenna to make it easier to store the transmitter.
Observe the precautions in section 1.1 before removing the antenna. If
the transmitter is to be stored for a prolonged period, r emove the battery
as described in section 1.6 above.
2.2 MAINTENANCE.
Since there are no calibration or tuning adjustments in the transmitter, the only
maintanance required is periodic replacement of the 9 volt battery. This should
be done at least once per year, or at the next opportunity if the “Xmtr Enabled”
light fails to flash when the transmitter is enabled.
The face of the transmitter, which is completely sealed, may be safely cleaned by
wiping with a damp cloth if care is taken not to get moisture in to the lock switch.
The battery compartment door and the junction between the front and back
panels are NOT water tight, however. The transmitter must never be immersed in
water. Care must also be taken not to splash liquids into the microphone or
digital switch access holes on the rear panel. It may be desirable to keep the
switch access hole covered with an adhesive label or plastic tape while not
viewing or changing the switch setting.
If further information or service is required, contact:
Holatron S ystems, LLC.
833 ILANIWAI ST, STE. 2
Honolulu, HI 96813
(808) 372 - 0956
www.holatron.com