model: sp-910 ***specification*** -rms: 3.5w+3.5w -pmpo: 500w -input sensitivity: 200mv -power supply: usb5v -dimension: w x h x d: 50x105x30 mm ***feature*** -safety: do not use extra power supply, just use usb port of computer, very safe. -multifunction: have folding cover, can be the stand when the speaker works, also can be the cover when it doesn't work, very portable to bring with. -mini: the dimension is very small, very easy to bring with. -colorful: have three different colors: green\blue\pink, very beautiful and fashionable. -stereo: designed for good sound. packing: gift box with polyfoam