Zoo Tunes Compact Portable Bluetooth Stereo Speakers for MP3 Players, Tablets, Laptops etc. Kitten Enjoy up to 10 Hours of music with the Built-in rechargeable battery. This speaker I powered either by the built-in rechargeable battery or a USB cable. Charges through a standard Micro-USB Cable (cable included) 3.5mm Line-in AUX jack to use with all non-Bluetooth devices such as computers, phones, MP3/4, CD players, etc. Compatible with most iOS and Android Devices like Apple iPad, iPhone and iPod, Samsung Galaxy, Nexus, Kindle, Surface etc. Other Features: Volume Control, On/Off Switch, 2.0 Watts total output, 40MM x 2 full-range neodymium drivers, Illuminated charging indicator. Approx. Dimensions: 3.7" x 3.7" x 3.2" (94x 94x 81mm)