AUDIOBOX – A300-U A basic 2.1 speaker capable of completing your essential audio experience. Features Double-bass power with Hi-energy reflex panel design Master and bass volume control USB powered with LED indicator One year limited factory warranty On-line warranty registration Technical Specifications Total output power (RMS) : 5W Satellite driver Size : 2″ X 2 Subwoofer driver size : 3″ Frequency response : 200Hz ~ 18kHz Impedance : 4? 2.2 speaker system with bass driver + 1 X reflector