400 Channel UHF Wireless Lavalier Microphone System 4 Unidirectional Clip On Mic 　 Features 　 　 　 Backlit LCD display showing RF level, AF level, Channel Frequency and mute status. 100 Selectable frequencies on each channel, multiple units can be used simultaneously Diversity operation for increased range/reliability, reducing dropouts. Built-In Tone Lock Squelch circuit protection from RF interference Automatic transmitter setup, the channel of the transmitter and receiver can easily synchronize Four channel receiver, Four microphones can be used at the same time Four XLR individual outputs and one 1/4" Mixed output Individual volume control on each channel Frequency: UHF 530MHz - 580MHz Frequency Response: 35Hz~18KHz Battery Life: 12 Hours ( AA batteries ) Range: Up to 300 feet Rack mountable, Fits 19" rack Package includes: (1) Four channel UHF diversity receiver (4) lavalier microphones with bodypack transmitters (1) 1/4" audio cable (1) AC-CD 110V-240V universal adapter (1) User's manual　 Plesae contact us if you have any questions.