Microphone

1.Compatible with these Radios:
GP328/HT750/HT1250/GP339/GP320/GP340/ MTP700
2.Comes standard with a 3.5mm earpiece jack for external earpiece
Microphone Impedance:2.2Ω,
Sensitivity:-36dB+/--2dB,
Frequency response:20Hz-1.6KHz