The Hear Technologies Freedom Back Receiver is a UHF wireless bodypack receiver designed to deliver clear mix monitoring with wireless freedom for musicians, singers, and actors in clubs, houses of worship, concert venues, and live stage applications. It operates in the 655 to 679 MHz frequency band and is compatible with your Freedom Back wireless transmitter. Ten groups allow access to 120 channels per band.Featuring an external antenna, an integrated belt clip, and an 1/8" stereo headphone output, it enables simple and fast physical setup. A single rotary control provides on/off switching and volume adjustment. Easily check the frequency, group, channel, battery indicator, and mono/stereo status via the backlit LCD. A top-panel LED indicates presence of RF signal. Powered by two AA batteries (included), the Freedom Back Receiver offers approximately four to five hours of operating time.