Radio Compatibility & Tech Notes
The H41-CF Behind the head headset, comes with a M21 Dynamic Noise Cancelling Microphone. You need to have the microphone pressed up against your lips to allow the mic to pick up your voice.
Technical Note: If you have the mic pressed up against your lips, volume turned all the way up, and the other person can not hear you still, you may need to switch to a Non-Amplified Electret EM56 Microphone #M560-E.
Motorola
CP100, CP150, CP200, CT150, CT250, CT450, CT450LS, GP2000, GP300, GP308, GP68, GP88,GTI, GTX, LTS2000, PR400, P040, P080, P110, P1225, P1225LS, P200,PRO3150, SP10, SP21, SP50, XTN446, XTN500, XTN600, XV1100, XV2100, XU1100, XU2100, XU2600
HYT
TC500, TC508, TC600, TC610, TC700
Speedcom
MT/ST