... Battery:build-in rechargeable 4Advantage:portable SE-728A Portable wireless PA amplifierSpecifications:Voltage:AC 220V/110V Built-in Rechargeable ... Battery:12V 1.2AH Frequency Range: VHF 160-260MHz oscillator:±0.005% quartzWireless Effective ... Range:35MApplication:Teaching, assembly, Conference, Church, Parade, Lecture, Auction, ...