B-33 4x100 Channel UHF PLL Microphone System 500MHz Band  Metal Microphone Body   　 Brand New 　   　MSRP: $599.00   Gtd-Audio's B-33 wireless microphone system delivers superior sound quality and professional features. It is designed for a wide range professional application with 400 selectable channels.  for easy use with multiple systems, no confusing frequency groups. It can be placed next to speakers with no feedback or distortion. It is perfect for professional use at any events. 　 　 　 　 　 　 Features 　 　 　 　 　 Backlit LCD display showing RF level, AF level, Battery Level, and Channel Frequency 100 Selectable frequencies on each channel, up to 15 units can be used simultaneously   Built-In Tone Lock Squelch circuit protection from RF interference 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 4 XLR individual outputs and one 1/4" Mixed output Individual volume control on each channel Frequency:  UHF 520MHz - 580MHz  Frequency Response:   45Hz~18KHz Battery Life:  12 Hours ( AA batteries ) Range:  Up to 600 feet ( 200 meters )     Package includes: 　 (1)  4 channel UHF receiver (4)  Hand-held microphones (1) 1/4" audio cable   (1) AC-DC adapter ( 110V-240V universal ) (4) AA Batteries and manual 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 Warranty 　 One Year Warranty Covered by GTD Audio ( USA ) Inc