SimplyVibe SV-S300 2.1 Channel w/ subwoofer Portable Speakers (Gloss Black) for iPad, iPod, iTouch, iPhone, MP3 Players, Laptops (Mac/ PC) - (USB Or Battery Powered) Turbo bass Technology with Digital Sound Processor (DSP) bass blaster Virtual 2.1 Channel output with subwoofer Dustproof design with high density fencing (White) Dual power supply: USB or 4AAA battery Works with iPad, iPhone, iPod, laptop or mobile devices.