Technical Pro 72-pow600 Technical Pro 8-Inch Battery Powered PA System VHF Microphone Product Specs: 600 watts peak power; Built-In rechargeable battery fully charges in approx 6 hrs; Outputs: dual 1/4-Inch One VHF wireless microphone with 75-Feet range; Two 1/4-Inch microphone inputs; USB flash drive input accepts drives up to 32 GB; plays .wav & .mp3; SD Card input accepts drives up 32 GB and will playback .mp3 and .wav files Separate volume controls for AUX, USB/SD Card, iPod, microphone and wireless microphone inputsDisplay screen shows battery life, date & timeUSB/SD Card Reversible iPod docking stationiPod will charge in docking station when unit is connected to an outlet and powered onEcho, bass & treble controlsImpedance: 4 ohmsSensitivity: 93 2dB (1W@1M) Frequency response: 80Hz - 20KHzFull Length perforated steel grillStackableIntegral top carry handle