System Parameter Carrier frequency:UHF 803-806 MHz Modulation mode:FM Channel number:2 Channel Ferquency stability:+0.005% Dynamic range:110 dB Max modulation:+_45 KHz Frequency response:80Hz-18KHz(+_3dB) S/N ratiov :<0.5% Working range: About 80 M(Without obstacle) Working temperature range range:-10 ํ-+40 ํ *System Parameter Receiver Receive mode:Heterodyne frequency conversion receive lntermediate frequency :110MHz,10.7MHz Antenna switch in:BNC/50 OHM RF squelch:>_75 dB Max level out:+_10 dBV *Transmitter Antenna:Hand-hold microphone with built-in screw antenna Output power :20mW RF squelch:50 dB Power:DC 2X1.5V AA Battery life:About 10 hours