Product Detail UHF 516-685 MHz, adopt PLL combined technology, 48 Mic. (12 Sets System) can be used simultaneously without interference CPU control with LCD display makes operation easy and performance outstanding The receiver adopt multi-level high frequency enlargement and has the high sensitivity Rack Mountable design Multi-level noise supervisory circuit . The "V2go UHF 4 Channel 128 Selectable Frequency Lavalier Lapel Wireless Microphone System" is best product for you. We recommended V2go UHF 4 Channel 128 Selectable Frequency Lavalier Lapel Wireless Microphone System