Product utlizes high power infrared transmitter and receiver to ensure better sound quality without interference even when people walking between the transmitter and the reciever. Aluminum shell case on both transmitter and receiver. Signals are transmitted without compression to Digital Power Amplifier, which produces 25W RMS each channel. Touch design, ON and Standby switch on both transmitter and receiver.Output power: Specifications: 2 x 25W RMS @ 10% THD; Signal to noise ratio: 80 dBA; Input sensitivity: 500mV +/- 20mV Frequency response: 60Hz - 20KHz.