Power supply: AAA*4 or Computer USB or 6V charger USB Charge cable Output power: 2W+2W Input power:100mV/1KHz SKP:4 OHM 2W Frequency range:100Hz~18KHz Plug: 3.5mm Excellent tone quality Easy to take, foldable Applicability TO: MP3 MP4 CD DVD TV Computer class audio frequency blowup Control : Power ON/OFF . Volume+. Volume-"