Shure BLX1 Bodypack Transmitter, H8 For this wireless system component to work, please make sure your transmitter and receiver match in frequency range (style) For proper operation, set each transmitter to a different channel on the receiver. Consult your BLX Channel guide to select compatible channel sets Adjustable gain control; Power and battery status LED Quick & easy frequency matching 2 AA batteries (included) provide up to 14 hours of continuous use 300 feet (91 m) operating range (line of sight) Quick and easy receiver frequency matching, plus easily accessible On / Off switch TQG connection for use with Shure lavalier, headset, earset and instrument microphones and guitar cables Up to 14 hours of continuous use with 2 AA batteries (included), plus power and battery status LED Lightweight, ergonomic design and adjustable gain control 300 ft (100 m) operating range (line of sight)