... to 270mhz; 80db 2.transmitter: 200to 270mhz; >80db ;9v battery ;30ma 3.main unit:200v ;100hz to16khz; inputs: wire mic ... ,wireless mic *2 and auxiliary*1 guitar input*1,usb input*1,sd card input*1;speaker:4 ohms 8 ... , 3inches*2 e.220v ac,12v 4.5ah*2 rechargeable battery, 30m, 290*400*200mmPackaging including:Main unit: 1 piece ... box: 1 piece Adaptor:: 1 piece Mic /guitar/auxiliary/USB/SD input amplifier