AmpliVox accessories expand the capabilities of your sound system. They are designed to enhance performance and simplify use. Buying genuine AmpliVox accessories assures quality and compatibility with any AmpliVox sound system.This wireless handheld mic kit includes external receiver with AC power supply and gives you a 300-foot radius from amplifier. Use it with any AmpliVox sound system. The A/B switch provides 2 operating frequencies to improve sound. The kit includes microphone, receiver, and transmitter.