Amplivox engineers and manufactures, Made in USA portable wireless, Public address, sound systems, multimedia lecterns, solid hardwood podiums for audiences from 20 to 5000 people indoors or oudtdoors, all UL listed for safety. Specialty outdoor Half-Mile Hailer commuication audio for crowd control,emergency, marine and public safety applications which include megaphones and wireless Hailers. Unique, UHF wireless,100 watt SW905 PA with builtin CD/Tape Recorder, up to 4 wireless mics, handle ,wheels;Voice Music mode;tripod mount. SPECIALTY WIRELESS POWERED SPEAKERS eliminates wires and cables.