Applied Microphone Technology AMT Wi5II Wireless Saxophone Microphone Clip-on Transmitter / Beltpack-less Wireless System with the ability to use with optional AMT Preamps, and other brands of wireless. 99 Channel System with 560 Available Free frequencies controlled by IR windows. (863-865mhz systems include on 16 Channels and 60 Free Frequencies) Includes ZRIII Dual Receiver that accepts two transmitters. Combine any combination of two 5C Clip-on transmitters, 5V Vocal mics, or 5B belt pack transmitters. Built-in recharable battery with LCD displays on both the transmitter and receiver. The ZRIII receiver includes two separate outputs on the back panel for complete control over each microphone.