U Fly Quiet UFQ-A6 Manual - page 8
Manual is about: Aviation Headset
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General
Battery power supply:3.7V
Weight: 259g ( include ear seals and mic boom)
Panel aircraft: 8-40VDC
Headphone
Transducer:40mm moving coil
Frequency Resonse:20 Hz-20 kHz
Nominal impedance @ 1 kHz
Mono: 300 ohms
Stereo: 600 ohms
Microphone
Transducer principle: Noise-canceling electret
Frequency response: 200 Hz-6000 Hz
Maximum SPL (Sound Pressure Level): 114 dB
Terminating impedance: 220-2200 ohms
Operating voltage: 8V-16V DC