The Acoustic Research AW-871 wireless speaker set has an established reputation for providing quality sound at a reasonable price. These speakers are manufactured by Audiovox, one of the pioneers of the wireless electronics industry. This speaker system operates in the 900MHZ spectrum and is rated for a maximum 300 foot range from transmitter to speakers. There are 20 watts of power total in this set with each speaker operating at 10 watts. Speakers can be placed anywhere – no unsightly cables. The speakers can be powered with a standard AC adaptor plug or 8 “C” cell batteries in each speaker. The speakers feature their own built in power, volume, tuning and balance switch so you can make adjustments to your listening experience wherever you have the speaker located. Each speaker features a 4″ woofer and a 1″ tweeter allowing for very good sound quality. Speakers are black and measure. Transmitter is black and measures. In original box and packing to include. Speaker AC Power Adapter x 2 (18V DC). Transmitter AC Power Adapter (12V DC). Installation and Operation Manual. Used once – like new condition.