Professional wireless set that can be used in various applications and works within 790-870 MHz frequency band. It contains a 4-channel UHF receiver and four wireless handheld transmitters with microphone capsules. RF stability: +/-0.005%. Frequency response: 50 Hz-18 kHz. Sensitivity: >-95 dBm. Distortion: <0.8% at -90 dBm. SN ratio: >90 dB. RF power: >10 mW.