Key Features: - New Bluetooth V3.0 technology, Compatible with all Bluetooth-enabled devices (2.1 and over). - Built in 1000 mAh rechargeable battery lasts up to 8 hours. - Connect any non-Bluetooth device via 3.5mm port. - Build in Mp3 player included, it could automatically play the music with a stand alone Micro SD card. - Small and compact. Size is 6 x 2 x 1.6 inches. Only Wieghted 8.3 ounces. - Soft touch rubber that surrounds the speaker.No worries about slipping or scratching the wood. Compatibility: Bluetooth Connection: - Bluetooth Enabled Mobile Phones - Bluetooth Enabled Tablet PCs - Bluetooth Enabled PCs, Laptops, Netbooks Aux-in: - All MP3 players, CD players, Laptops, Tablets and Other Music Devices with a 3.5mm audio socket Micro SD card: - Compatible with Micro SD card up to 32GB. - Supported formats on the Micro SD card are MP3, WMA and WAV formats.