SOUNDPLUS® 2-CHANNEL INFRARED RECEIVER The WIR RX15-2 is a two-channel, infrared receiver designed for use with a transmitter operating on 2.3 MHz or 2.8 MHz. This easy-to-operate, headset-style receiver is ideal for listening applications where excellent sound quality is essential. Each earphone features its own individual volume-control knob. A push-button frequency selector makes it easy to alternate between 2.3 MHz or 2.8 MHz operation.