Iphone earphone for helmet
1.Double SPK fixed inside the helmet, have no pressure to ear, can be use for long time.
2.Finger PTT convinence to use.
3.Stereo sound
4.It can be used to answer/reject telephone
5.Press PTT two times to choose your favor song.
6. Can adjust volume by earphone.
SPK:
size:36mm
Sound pressure level:90dB±3dB
Impedance：32Ω
Audio output：200mW

Microphone：
Size：9.7*6.7
Frequency：20-16000HZ
Sensitivity：-36dB±2dB
Impedance:2.2k Ω