The Azden IRR-40P 2-Channel Infrared Receiver is designed for use with Azden IR (Infrared) wireless transmitters (sold separately). The IRR-40P features a built-in amplifier with 20 watts of output power. Connect a pair of passive speakers to the speaker outputs and the IRR-40P becomes a self-contained PA system that simultaneously operates up to 2 wireless IR microphones, and supports external audio devices via the line input connections. 2 channels operate simultaneously Built-in amplifier with up to 20 watts of power Four speaker output connections Remote volume control Microphone priority feature automatically lowers input audio