This 4 channel receiver is designed for use with large area Infrared systems. Users love the sleek, comfortable design with a convenient rotary channel selector and an easy-to use off/off/volume control. The RX12-4 can be used with mono or stereo headphones and earphones or a neckloop. Dual infrared detectors provide maximum sensitivity and operating range. The receiver mutes when the IR signal becomes too weak to permit good audio quality. Crystal frequency control means drift-free performance and reliable reception. Batteries easily last up to 60 hours with 2 AA and 30 hours per charge with rechargable batteries.