Wireless 5.8GHz Speaker Amplifier Rear Channel Digital Audio Link for Surround Speakers Selectable 6-channel transmit system, transmits at 5.8GHz Ideal for Dolby 5.1 Digital, Pro Logic II, DTS, SACD, DVD and MP3 audio systems Built-in 25-watt x 2 stereo amplifier Adjustable speaker and line level input control Two (2) diversity receiver antennas for optimal audio reception