Specifications: Output Power: 70WT.H.D<0.1%Frequency response:50Hz 20KHz ± 3dBAudio input:Wireless receiver/USB/TYPE/CD/DVD/Wire Mic/External audio sourceSpeaker:8" full range speakerPower and voltage:AC220V 50Hz/110V 60Hz availableBuild-in rechargeable battery:2X12V/5AhBattery available time:4 hours( Amplifier),3 hours( USB/DVD)Wireless receiver:UHF 700MHz-800MHzWireless mic:collar clip/ hand-held mic/ headset mic.Wire mic:Any mic is available