Amplivox SW223 portable buddy includes wireless handheld mic and 50-watt wireless multimedia stereo amplifier with built in receiver is designed for audiences up to 1,000 and rooms up to 10,000 sq. ft. Computer and projector interface cables included. Optional power options: AC adapter S1460 (Sold Seperately) or power up to 200 hours with 10 D-cell alkaline batteries.