If you are looking for the best portable speakers for your devices, look no further because Wowee One is your best choice. What separates this speaker from other portable speakers that utilize surfaces for sound is the incorporation of gel audio technology, which produces bass frequencies approximately three octaves lower than comparably-sized units. This small speaker creates a deep bass out of virtually any surface that you put it on. Weighing less than half of a pound, this pocket size device can travel with you anywhere you go. Built with a standard 3.5mm audio jack, the WOWee One can be partnered with many other devices including MP3 players, mobile phones as well as the Pad! It has an internal Lithium Ion battery that can provide an audio playback for up to 20 hours and is rechargeable using a PC USB port. Features: Dimensions (WxLxH): 60 x 120 x 25.8 mm Product Weight: 200g Driver: 1 x conventional Cone speaker, 1 x SFX Gel Audio™ driver Frequency Response: 40Hz ~ 20kHz Amplifier: D-Class Output Power: 2W RMS Input Power: 5V DC (via mini USB) Rechargable Battery (Built-in): Lithium Ion 3.7v Playback Duration: Up to 20hrs Audio Input: 3.5 mm audio jack Compatible: iPod™, mp3, mp4, mobile phone and computer applications. Package includes: USB Charging cable 3.5mm Jack cable