... chamber designed to ensure high-fidelity, CD quality sound effectsRechargeable polymer battery, convenient, practical,Up to 8-10 hours of practical ... Output Power2*10mwAudio OutputHi-Fi Stereo HeadsetFM 76MHZ-108MHZBattery TypePolymer lithium batteryInput PowerComputer USB port DC5V/500MA ChargerWorking HoursCharge of about ...