This potable speaker is different from Sony Ericsson MS430 Portable Media Speaker Stand, it has a build-in battery as high as 2200mAh battery capacity. Pull out the right side of logo,you’ll find a USB interface and a headphone interface. Twist and let cap spring back,plug the headphone jack into mobilephone or media player,then the back of the mobilepone can rest against the speaker to act as a stand. There’s no power button, it just automatically powers on and off when connected. It’s perfect gift for your frends! Buy it, and rocking with friends!