Specifications: Output Power: 70WT.H.D<0.1%Frequency response:50Hz 20KHz ± 3dBAudio input:Wireless receiver/USB/WMA/MIC/External audio sourceSpeaker:6" woofer+ 8" woofer+3" tweeterPower and voltage:AC220V 50Hz/110V 60Hz availableBuild-in rechargeable battery:2X12V/7AhBattery available time:5 hours( Amplifier), 4 hours( MP3/WMA)Wireless receiver:VHF 170MHz-270MHzWireless mic:collar clip/ hand-held mic/ headset mic.Wire mic:Any mic is available