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ALL the Nicepower standard ANR headset will use AA battery powered, no longer take 9 volt battery power.
ANR Aviation Headset (ANR power: two AA battery)  
GA Use Dual Plugs
Super Soft Double Foam Head Pad
Noise-canceling electret Microphone
Precision flexible boom for perfect microphone placement
Easy-to-wear super soft silicone gel ear seals
Headband Size Adjustment
Straight cord from headset to molded plug, 150CM
Assembled strictly following the FAA TSO standards
Color: Black, green
Noise Reduction Ratings (NRR):24dB
Type: Dynamic (F30)
Frequency Response:50 Hz to 20 kHz
Sensitivity:95+/-5 dB SPL (1 kHz, 1 mW input per earcup side) full volume on ear simulator
Active Noise Attenuation:
Dynamic 42 ohms:
Rate Input: 30mW     Max.Input:100mW
Speech Sound:
Dynamic 300 ohms:
Rate Input: 30mW     Max.Input:100mW
Microphone and Amplifier:
Element Type: Noise-canceling electret
Frequency Response:100Hz to 5 kHz
Operating Voltage (supplied by aircraft ):8-32 Volts DC
Matching Impedance: 150-1000 ohms
Sensitivity:-33+/-4 dB
(ref: 0dB SPL=20.0uPa at 1 kHz with 10 Vdc 150 ohms AC load)
Operating Temperature: -20 to 70°C
Cordage: Straight cord from headset to molded plug, 150CM
Intercom Connections Plug:
Earphone Plug: PJ-055( .25"F6.3 phone plug)
Microphone Plug:PJ-068( .206"F5.2 phone plug)
Weights: 600g
Noise Reduction Specifications:
Attenuation Frequency Band__________20Hz~20KHz
Main Attenuation Frequency Band__________20Hz~600Hz
Attenuation Capability__________18~21dB
Power Consumption__________30 mW
Headset size range Height: 10 to 14 cm
Color: Green/Black
Boom: Flexible Boom
The AA battery box
1. The battery module requires two AA battery. The power of G2 ANR comes from AA battery, not aircraft power.
2. Figure 1: There are on/off switch, Led light and mp3 input on the top of battery box.
              A. When the switch is on (I), the Led will be on and the ANR function starts working.
                   When the switch is off (o), the power for the battery box is shut off and the ANR function stops working.
              B. The Led is green when the power is on and the batteries are fully charged. The led turns red when the batteries are low.
3. S/M switch: There is an s/m switch inside the battery box, see figure 2. When the switch is on "M", the output of earphone plug is mono and when the switch is on "S", the output is stereo.
4Battery changing: move the clip to the left or right;press the opener and push it out; put the batteries in according to the "+""-" signs inside; put the opener on and push it back. See figure 3.
to save on batteries, pls shut off the power when the headset is not in use.