Dual-channel design, two Handheld (or Lapel) wireless microphone can be used together without interference. High-precision quartz crystal locked frequency. Looking noise to solve the problem of noise interference which is hard for general wireless receiver to overcome. High sensitivity and high S/N ratio, long receiving distance, and never staccato, never wander. Built-in noise reduction compress-expand circuit. Excellent selectivity, multi-channel simultaneously, without mutual interference. Standard metal casing, avoid interference effectively. Most suitable for Studio,Karaoke,Broadcast etc. Operating distance is up to 50 meters in ideal environment and 30-40 meters in the complex environment. Product Features: VHF220-270MHz wave band Frequency Response: 60Hz-16KHz3dB SNR:>90dB frequency stability:0.005% Output power:0-400mV T.H.D