Product information:

Amplification anywhere without wires! All-in-one wireless receiver, 2-channel 10 Watt power amplifier (15 Watt Peak, 10 Watt RMS). Place up to 3,000 feet away (at 216 MHz) from the stationary transmitter and 150 feet away from a Listen portable transmitter to receive and amplify the transmission audio. Perfect for Soundfield applications! This unit is powered by AA batteries (alkaline or NiMH rechargeable), or 15VAC power supply or 12 VDC, for 15/10 Watt continuous power. It has unbalanced auxiliary input and output ports. Listen's signature Look&ListenTM LCD display shows channel, lock, and battery level. Comes with adjustable mounting bracket.