(Reconditioned) SimplyVibe SV-S550 (Dark Grey Color) Premium Portable Laptop (Mac/ PC) Stereo Speakers w/ Subwoofer DSP Bass for iPod, iPhone, Android, MP3 Players, Tablet Devices (Plug & Play USB) Turbo bass Technology Subwoofer with DSP bass blaster. Dual drivers provide room-filling stereo acoustic. Dust-proof and screw-less casing, Sleek aviation-class aluminum unibody design Compatible with laptop, iPod, MP3, MP4,MP5, cellphone, PSP etc. wia 3.5mm cable (included) Anti-mobile phone signal interference - no static noise! Powered by USB source (Plug & Play) (No Batteries Needed!)