2 Mr. Dj MICVHF8800 4 CH Professional VHF Wireless 4 Handheld DJ KTV Stage Microphone PA Mic System with Digital receiver Mr. Dj MICVHF-8800 Professional VHF Wireless Microphone System with Digital Receiver Set of 4 VHF Wireless microphone system Desktop receiver and enhanced muting high signal-to-noise ratio Audio mute circuitry for quiet operation Advanced companding circuitry AF Signal LED meter on each channel High-Quality Wireless VHF Receiver with Dual Antennas Automatic transmitter setup the channel of the transmitter and receiver can easily synchronize 4 channel receiver 4 microphones can be used at the same time Battery Life: 10 Hours full-rack quad VHF wireless receiver Set of 4 VHF Wireless microphone system Desktop receiver and enhanced muting high signal-to-noise rate Audio mute circuitry for quiet operation Advanced companding circuitry AF Signal LED meter on each channel Digital L.E.D Display Individual Channel Volume Controls 350 Feet ( 100 Meters) 4 Pcs Wireless Dynamic Handheld or Headset Mic power Supply Frequency Range: 180-270MHz