Portable Vibration Speaker, UbiRock-Alien, Ideal for your iPhone, Ipod, mp3, and laptop The UbiRock works by transfering sound vibrations throughout any rigid flat surface, via the speakers bottom, converting the surface into external speakers. The UbiRock works best on most tabletop surfaces. Surfaces that are flat and wide project great sound quality. Playback on different surfaces will produce different sound projections.This speaker contains a built-in battery that is rechargeable. Simply plug the USB cable into the speaker and connect the other end to a computer USB port to charge. Typical charge time is 1-2 hours It is a new stylistic product of audio frequency minus the huge amplifier. It lets you enjoy different music effects when the speaker is placed on different mediums,such as wood,glass, walls and so on. P Power supply:DC5V /USB powered, built in rechargeable lithium battery Power consumption:5W Frequency:100Hz~20kHz Idean for MP3, MP4,PC,Iphone, ipod,computer,mobile and etc Standard 3.5mm audio plug