MegaVox PRO PA System w/ Built-in Wireless Receiver, Wired Handheld Mic & Built-in Rechargeable Battery - Firemen, policemen, coaches, FBI agents, Marine drill sergeants, and auctioneers all choose the MegaVox Pro. This PA system delivers 126 dB SPL of clear speech projection from a 22W amplifier. True AC/DC functionality with a 110/220 power supply make the MegaVox Pro truly universal û take it anywhere! It weighs in at only 15 pounds! Features: Built-in UHF Wireless Receiver w/ 16 User-Selectable Channels, 30 Watts, Built-in Rechargeable Battery, True AC/DC - 110/220 Power Supply, Signal Alert Button, 1/4in Line Input, Auxilliary Input, Line Level Output, External Speaker Output.