Used Acoustic Research remote speakers. Acoustic Research AW877 Wireless Speakers. (Often Confused with AW771). 7.5-watt amplifier built-in, runs on AC adapter or batteries. 2″ dome tweeter, 5″ woofer, acoustic suspension design, with L/R/Mono switch. 900 MHz transmitter with RCA/mini-jack adapters, up to 250 ft range, 3 channels. Power/Volume/Tuning knob on speaker, auto level control. Portable with inset handles, meant for adding sound to other rooms.