Accutone DT Series User manual

User Manual
www.accutone.com
© Copyright 2011 Accutone Technologies Limited, All rights reserved.
Do not copy or re-distribute any contents.
Accutone and the logo device are registered trademarks of Accutone Technologies Limited.
Photo credit: Benjamin A. Ward
DT Series Anti-Radiation Headset for DECT Telephones
DT808 / DT818

DT-series Anti-Radiation Headset for DECT Telephones
All DECT cordless telephones emit the same type of pulsed microwave radiation (about
1.8 GHz or higher) as ordinary GSM mobile phones. Emission is about 6 V/m within one
meter of the base unit. Radiation is continuously generated for as long as it is plugged in.
Dr. Lennart Hardell’s* paper on mobile phone use and brain tumors shows a dose
response increased brain cancer risk for long-term use. A DECT phone is a mobile
®
phone, so for health concerns Accutone has developed a series of Anti-radiation
headset, for both mobile phone and DECT phone.
The DT808/DT818 anti-radiation headset for DECT phone shares the same technology
that have been tested by two independent laboratories. Results showing Specific
Absorption Rate (SAR) value obtained when used with headset showed a 99.5%
reduction compared to phone use without headset. Furthermore, with headset cable
wrapped around the phone’s antenna - even in the worst case results - the headset
reduced the SAR in the head by a 96% compared to the normal use of the phone. All
these results are approved by BABT Product Services.
Aside from the anti-radiation design, the DT808/DT818 also includes other significant
features, like surge protection in its ASP circuitry, mute button for privacy, volume
control, impedance compensator to fit all phones and high-end professional speaker
with noise-canceling microphone.
Lennart Hardell*
Dr Lennart Hardell is professor in oncology and cancer epidemiology at the University Hospital in Orebro, Sweden.
Most of his research has been on risk factors for cancer such as exposure to pesticides and persistent organic
pollutants. Examples of such agents are herbicides, dioxins, PCBs and brominated flame-retardants. During recent
years he and his co-workers have studied use of cellular and cordless telephones and the risk for brain tumours. He
works also as a consultant at the Department of Oncology at the hospital.
Identifying Key Component to your DT808 / DT818 headset
DT818 headset for DECT phones
1
2
4
3
5
7
1. Headrest with foam
2. Extendable headband
3. Speaker chamber (27 or 40mm)
4. Mute switch
5. Speaker volume control
6. 2.5mm plug to DECT phone
7. Microphone gain setting
8. Bendable microphone boom
9. Microphone with windscreen
10. Speaker adjusting arm
8
9
1. Headset Wearing Method.
A
B
D
DT808 / DT818 Anti-Radiation Headset
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DT818
®
Accutone ’s DT-series headset include DT808 (27mm speaker) and
DT818 (40mm speaker)
6
10
C
The DT808 / DT818 headset is a highly flexible
design that fits most headsizes:
(A) By gently pulling the headband out, you can
extend the headset to fit a larger head-size
(B) The microphone boom can rotate up to 270º,
suiting both left and right ear wearing
(C) The adjusting arm holds onto the axis of the
the speaker chamber for vertical adjustments.
(D) The microphone arm is a bendable design so
users can easily adjust the distance between the
microphone and user’s mouth.

Most of all DECT cordless telephones in the market use the universal 2.5mm headset
port. (But not all DECT phones have a headset port, please check the user manual of
the DECT phone to see if the feature is available).
Locate the headset port of the DECT telephone (check your manual if needed), insert
the 2.5mm plug into the jack to complete connection.
2. Connecting headset to your DECT phone.
3. Understanding the In-line Controller.
Besides the Anti-radiation circuitry, the Microphone Mute Switch on the in-line
controller offers user quick privacy by muting the microphone pick-up. Slide the switch
to position (A) for muting and back to position (B) to go back to normal speaking mode.
A
B
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User Manual
Microphone Mute Switch
Speaker Volume Control
C
The Speaker Volume Control (C) dial on the side of the inline controller allows user to
adjust the incoming volume. Increase volume by turning the dial towards the speaker
icon, and opposite direction to decrease volume.
Microphone Gain Switch
D
The Microphone Gain Switch (D) acts as a microphone pairing between the headset and
your DECT telephone. It is not designed to be a volume control, hence user is only
required to set this once.
Notice the three positions marked by different sizes of circle, the leftmost and smallest
circle indicates lowest microphone gain. Starting from the leftmost setting, make a call
and ask the person on the other side which setting has the optimum sensitivity level.
Caution: Make sure you switch to the leftmost position (E) before you adjust this
setting, because different DECT telephones have very different microphone
sensitivity, if the microphone gain is set too high, the headset speaker may
SQUEAL, which can cause damage to the user's ear and the headset.
!
E
DECT telephone
DT808 / DT818 Anti-Radiation Headset
User Manual P.4
C

User Manual User ManualUser Manual P.6
4. Detailed Technical Specifications.
DT SERIES DT808 DT818
General Characteristics
Type Monaural Over-the-Head
Speaker ø27mm ø40mm
Microphone ø6 x 2.7mm ø6 x 2.7mm
Cord Length 1.2 meters with volume control
Plug 2.5mm golden plug
Speaker Characteristics
Type Receiver Speaker
Rated Impedance 32W±20% (@1V, 1kHz)
Rated Power Input 10mW 10mW
Maximum Power Input 30mW 50mW
Frequency Range 300 ~ 4,000Hz 20 ~ 20kHz
Sensitivity 107dB±3dB 104dB±3dB
Microphone Characteristics
Type Electret Condenser Microphone (ECM)
Impedance 1,000W
Sensitivity -60dB±4dB/µBar
Directivity Noise-cancelling
Operation Voltage 1.5 ~ 10V (DC)
Current Consumption <500mA
Inline Volume Control Features
Anti-Radiation Circuitry Blocks radiation generated by DECT phone
Muting ON/OFF selector for microphone muting
Reception Level Rotatable potentiometer for speaker volume
adjustments
Transmission Level 3 position levels for microphone gain
adjustment
5. Precautions, Trademark and Ownership.
Please read the following safety instructions before using your DT-series headset
WARNINGS
ŸListening with device at high volume may damage your hearing.
ŸAdjusting the volume for microphone or speaker too high may cause squealing
(feedback sound) and can cause damage to your hearing.
ŸDo not pair the device with any equipments not specified by this user manual. Use
only with standard DECT cordless telephones with 2.5mm jack.
ŸDevice must be hooked up according to the method listed out in this manual.
ŸPlace product far away from water, fire, extended exposure of direct sunlight or
magnetic field, and places of excessive dust, moist, rain, shock or electromagnetic
radiation.
ŸDo not drop this device or subject it to external shock which may cause
malfunction.
ŸDo not dissemble or attempt to open up the casing under any circumstances,
contact your local dealer or retail outlet on repair or replacement.
ŸWhenever unplugging the 2.5mm plug from the DECT phone, apply force to the
plug part only. Jerking the cord instead of the plug may cause damage to the
product.
ŸDo not use liquid cleanser or aerosol cleanser as they may damage the device or
finish of the product. Use a dry cloth to clean the external portions of the product.
ŸPrevent the headset from coming into contact with moisture or liquid, to protect
against damage to it or injury to you.
RECYCLING
ŸThe DT series headset is WEEE compliant and must be recycled or disposed
properly. Contact your local recycling center for proper disposal.
WARRANTY
ŸDo not remove or alter any serial number print or sticker on any part of the
device, as this will automatically void the product’s warranty.
TRADEMARK & OWNERSHIP
ŸAccutone and the logo design combined are trademarks or
registered trademarks of Accutone Technologies Limited.
DT808 / DT818 Anti-Radiation Headset