Check the listing for details. GTD Audio 2x800 Ch UHF Wireless Lavaliere Lapel Headset Microphone System 733L. Color: Black, Condition: New. Listed at 169.00 USD. G-733L 800 Channel UHF PLL Microphone System Brand New MSRP: $599.00 Gtd-Audio's G-733L wireless microphone system delivers superior sound quality and professional features. It is designed for a wide range professional application with 800 selectable channels, automatic frequency scanning, true diversity operation, Tone Lock squelch circuit, automatic transmitter setup. It's the perfect for professional use at any events. Features Backlit LCD display showing RF level, AF level, Channel Frequency and mute status. 800 Selectable frequencies on each channel, multiple units can be used simultaneously True diversity operation for increased range/reliability, reducing dropouts. Built-In Tone Lock Squelch circuit protection from RF interference Automatic frequency scanning to find and set the best available channel Automatic transmitter setup, the channel of the transmitter and receiver can easily synchronize Dual channel receiver, Both microphones can be used at the same time Two XLR individual outputs and one 1/4" Mixed output Individual volume control on each channel Frequency: UHF 550MHz - 590MHz ( Comply with FCC new frequency rule ) Frequency Response: 35Hz~18KHz Battery Life: 12 Hours ( AA batteries ) Range: Up to 600 feet ( 200 meters ) Rack mountable, Fits 19" rack Package includes: (1) Dual channel UHF diversity receiver (2) Lapel, headset microphones with transmitters (1) 1/4" audio cable (1) AC-CD adapter 110V-240V universal (4) manual Warranty One Year Warranty Covered by GTD Audio ( USA ) Inc