GXTSONIC MMA-3755A User manual

FCC NOTICE:
This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause
harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or
more of the following measures:
⚫Reorient or relocate the receiving antenna.
⚫Increase the separation between the equipment and
receiver.
⚫Connect the equipment into an outlet on a circuit
different from that to which the receiver is
connected.
⚫Consult the dealer or an experienced radio/TV
technician for help.
FCC STATEMENT
1. This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
⚫This device may not cause harmful interference, and
⚫This device must accept any interference received,
including interference that may cause undesired
operation.
2. Changes or modifications not expressly approved by the
party responsible for compliance could void the user's
authority to operate the equipment.

LOCATION OF CONTROLS:
1. :Play/pause button
2. :Previous song/decrease music volume level
3. MIC VOL: Mic volume +/-, slide switch
4. ECHO: Echo+/-, slide switch
5. VOL: Music volume +/-, slide switch
6. :Next song/increase music volume level
7. :LED lights on/off
8. :Power ON/OFF Switch; Mode Switch:
Bluetooth/Micro SD card/USB reader
9. Phone holder
10. DC 5V: Micro USB charging port

11. Micro SD: Micro SD card port
12. OUT: Line-out port
13. USB: USB port
POWER SOURCE:
Charging the Battery:
The unit has a built-in Li-ion rechargeable battery, charge it
before first time use or when it is drained as follows:
1. Connect the small plug from the supplied USB
Connection Cable to the Micro USB Port on the unit.
2. Connect the full-sized USB plug from the supplied USB
Connection Cable to the USB Port on the Personal
Computer or USB Charger (Computer and USB Charger
not included) as illustrated below:
3. When charging, the Red Charging Indicator on the unit
will illuminate. When finished charging, it will turn off.
NOTES:
1. When charging, you can play music or sing as usual.
2. Your battery will last longer if you are following these
simple guidelines for caring and storing.
A. Before first time use, charge the unit approximately 4
hours until the unit is fully charged.
B. Charge and store the unit within the temperature
range of 5°C - 35°C (40°F - 95°F).
To Computer or any USB Charger

C. Do not overcharge (longer than 24 hours). Excessive
charging or running the unit until battery fully drains
will damage the battery. Battery life will be extended if
you keep the battery fully charged.
D. Battery life naturally shortens slowly over time.
E. The rechargeable battery incorporated in this product
is not user replaceable.
BATTERY DISPOSAL WARNING!
To reduce the risk of fire or burns:
Do not disassemble, crush, puncture, or short external
connector contacts.
Use only with specified charger and player. Do not dispose
of in fire or water.
Do not dispose to high temperature above 60°C (140°F).
Store between 0°C (32°F) and 60°C (140°F).
Keep away from children.
See operating instructions of this battery or product.
Batteries should be recycled or disposed of as per State and
Local guidelines.
OPERATION:
General Operation:
1. Charge the built-in Li-ion battery as previously
instructed.
2. Power On
3. Long Press the Button to switch to desired
playback mode. The unit will sound a prompt with your
selection (see list below):
Playback Modes:
Voice Prompt:
BT (Bluetooth)
Bluetooth ready for
connection
USB
USB
Li-ion Battery Must Be
Disposed Of Properly

TF (Micro SD) Card
Memory Card
Note:
If the TF (Micro SD) Card and /or USB Device has NOT
been inserted into the unit, the corresponding selection
will not available.
4. During playback:
⚫Press the button to pause; press again to
resume to normal playback.
⚫Press and release the or buttons
repeatedly to adjust volume level as desired.
⚫Press and hold the or buttons repeatedly
to skip tracks.
5. When finished listening, turn off Button to shut off
the unit.
BT MODE
For first time use or re-pairing the unit to a new BT Device,
follow instructions below:
1. Power on the unit and enter to BT mode as previously
instructed. You will hear an audible prompt say,
“Bluetooth ready for connection”.
2. Power on the external BT Device and enter to BT
searching mode. Start pairing following the on-screen
instructions from the external BT Device. When paired,
the unit will sound a prompt “Bluetooth connected”.
3. If pairing is complete you may now play music with
your external BT Device.
4. During playback:
⚫Use the Volume Controls on the paired BT Device to
adjust volume level as desired.
⚫Using the Pause; Skip Controls on the paired BT
Device to pause, skip tracks as desired.
⚫Sing or speak to the Microphone. Then:
A. Slide the MIC VOL (Microphone Volume) Control

Knob on the unit to adjust the volume level of the
Microphone as desired.
B. Slide the ECHO (Microphone Echo Effect) Control
Knob to adjust the echo effect of the Microphone
as desired.
C. Slide the VOL (Music Volume) Control knob to
adjust the volume level of the music as desired.
Note: If feedback noise (high audio frequency noise)
is coming from the speaker, reduce the music volume
level or reduce the microphone volume level by
sliding the MIC VOL (Microphone Volume) Control
Knob downward.
5. To shut off the unit, press and hold the Button on
the unit.
Notes:
⚫When the external BT Device searches for the unit, our
model number “MMA3755” will appear on the display
of external BT Device.
⚫If while pairing you are asked for a code, please try
"0000" or "1234".
Normal operation after paired:
1. Power on the external BT Device and enter to BT mode.
2. Press and hold the Button on the unit to power on the
unit.
3. Wait a few seconds until the unit auto pairs to the
external BT Device.
4. If pairing is complete you may now play music and/or
sing with your external BT Device.
TF (Micro SD) Card:
To play the music in TF (Micro SD) Card:
1. In power off mode, insert the TF (Micro SD) Card (not

included) into the TF (Micro SD) Card Slot contacts
facing up as illustrated below:
2. Power on the unit and enter to TF (Micro SD) Card
mode as previously instructed:
⚫You will hear an audible prompt say, “Memory Card”.
⚫Music in the card will be played back automatically.
3. During playback:
⚫Press the Button on the unit to pause; press
again to resume to normal playback.
⚫Press and release the or buttons
repeatedly to adjust volume level as desired.
⚫Press and hold the or buttons repeatedly
to skip tracks.
4. When finished listening, turn off Button to shut off
the unit.
Notes:
⚫Up to 16GB TF (Micro SD) Card/USB Device
supported.
⚫When inserting the TF (Micro SD) Card/USB Device,
make sure the direction you selected is correct.
Never insert violently to avoid damaging the TF
(Micro SD) Card/ USB Device or the unit. If it does
not work, please check if the direction is correct.
⚫Before replacing TF (Micro SD) Card/USB Device,
make sure the unit has been powered off.
⚫You also need to download the desired music in MP3
format into the TF (Micro SD) Card/USB Device
before insert into the unit.

AUX OUT:
To listen to music and sing through the external Audio
Power Amplifier:
1. Power on the unit and enter to BT playback mode as
previously instructed.
2. Connect one end of the supplied Audio (OUT)
Connection Cable to the AUX In/Line in Jack on the
external Audio Power Amplifier as illustrated below:
3. Connect the other end of the Connection Cable to the
AUX (OUT) Jack on the unit as illustrated above. The
unit will automatically switch to AUX (OUT) mode.
(Note: Sound from the speaker will automatically cut
off).
4. To resume to normal playback mode, unplug the cable
from the AUX (OUT) Jack.
USB:
To play music in a USB Device:
1. In power off mode, connect the USB Device (not
included) into the USB Port as illustrated below:
To AUX Out/Line Out/Phone Jack on
the external Audio Player

2. Power on the unit and enter to USB mode as previously
instructed:
⚫You will hear an audible prompt say “USB”.
⚫Music in the USB Device will be playback.
3. During playback:
⚫Press the Button on the unit to pause; press
again to resume to normal playback.
⚫Press and release the or buttons
repeatedly to adjust volume level as desired.
⚫Press and hold the or buttons repeatedly
to skip tracks.
4. When finished listening, turn off Button to shut off
the unit.
TROUBLE SHOOTING：
Check the following before requesting service:
SYMPTOM
POSSIBLE CAUSE
POSSIBLE
SOLUTION
Can’t
power on
Built-in battery
drained
Recharge the
battery as page
3-4
The unit is in
power off mode
Turn on
Button to power
on the unit.
No sound
Volume of the
Increase the

or sound
weak
unit was set to
minimum position
volume level by
press and release
the Button
repeatedly
Volume level of
paired/connected
device is in low
level
Rise the volume
level of the
paired/connected
device
Sound
distortion
Volume level too
high
Reduce the
volume level by
press and release
the Button
repeatedly
Volume level of
the
paired/connected
device too high
Reduce the
volume level of
the
paired/connected
device
BT not
functioning
The external BT
device had NOT
paired to the unit
Pair the external
BT device to the
unit as page 5-7
The external BT
device too far
from the unit
Place the external
BT device close to
the unit
SPECIFICATIONS:
Power
Source
Built-in DC 3.7V, 1200 mAh
(4.44WH) rechargeable Li-ion Battery;
recharge by DC 5 V through DC
5V (Micro USB) Port
Impedance
of Speakers
5Watt, 3 Ohm
Audio Power
3Watt (RMS)
BT Version
5.0
BT Operation
Distance
10m (30 feet in open area)

PACKAGE INCLUDES:
1 x MMA3755 Bluetooth Speaker
1 x Owner's Manual
1 x USB Connection Cable (For charge only)
1 x Audio (out) Connection Cable with 3.5mm Plugs
SPECIFICATIONS AND ACCESSORIES ARE SUBJECT TO
CHANGE WITHOUT NOTICE