... ; 80db 2.transmitter: 200to 270mhz; >80db ;9v battery ;30ma 3. main unit:200v ;100hz to16khz; inputs: wire mic*2,wireless mic *2 ... ,12v 4.5ah* rechargeable battery, 30m, 220*270*145mmPackaging including:Main unit: 1 piece Waistband belt: 1 piece Headset microphone: 1 piece ...