... loud sound reproduction ,well suited for any PA application,in cluding home Karaoke ,education ,seminas ,business conferences ,worship ... middle ,3 inch tweetervoltage:AC110-240V/50/60HZbuit-in rechargeable battery12V/7AHwireless receiveUHF600 MHZ ~900MHZ,VHF200MHZ~300MHZWireless ... Body-pack tiansmitterMicAll kinds of MIC buit-in audio wirelessDimensions 330X180X420mmN.W.13KG BK-318MA Portable Speaker