SMALL SIZE, GOOD SOUND USB POWERED 3.5mm AUDIO PLUG VOLUME CONTROL BUILT FOR TRAVEL Full-range stereo sound and compact size optimized for mobile listening Easily connects to notebook computers and other USB-equipped devices Self-powered and easy to install - require no batteries or power adapter Dual external speakers improve stereo separation and sound field Ideal to enjoy and share music and other audio Shielded to prevent distortion and maintain clear, crisp sound