USB speaker1.It can be connected with notebook/laptop, desktop, mobile phone, MP3/MP4 player through USB line and 3.5 inch audio cable..2 With the world's most advanced Class-D Digital Power Amplifier, speakers are able to perform high efficiency, low distortion-rate, and detailed sound.3 It plays ideal sound for genernal household the music fans and video gamers. The sound quality can be compared favorable with normal 2.1 speakers��4.With small and elegant case design,it is easy for carrying. On/off and volume control are embedded in one with LED back lighting, both fashionable and user-friendly.5 With the professional full-range and neodymium driver designs,it easily out performs other mini 2.0 channel speakers.6 High power efficiency and quality performance, achieving energy saving and environmental protection purposes at the same time.