Superhet dual conversion, Smart sensitity receiver, high performance saw filter, excellent anti jamming capability, Auto mute and anti-skip system which can totally remove the noise when turn on/ off the microphone, double step-up voltage design which protect the projection power when the battery is weak, reliable SMT production. Working range: 100M. Frequency: 720-820MHZ, General track: 56CH. FR: 80HZ-18KHZ( ± 3dB) , S/ N: > 90dB, sensitivity: -95dBm, output power: 10mW