Cyanics Ultra Compact Portable Speaker for iPod/iPhone/MP3/Laptop (Color: Black) Compatible with iPod, iPhone 3G, 3Gs, MP3 players, and other music devices with 3.5 mm audio jack. Lightweight (1 oz), Personal music amplifier lets you share your tunes with friends Built-in rechargeable battery (Li-Polymer) & plays up to 8 hours of music LED displays for charging and operation status. Coin slot allows the speaker to sit upright as a stand Conveniently connects to any music player or laptop with 3.5-mm connection and music phones with 2.5-mm adapter