ADIN B1BT is the new generation of Vibration Speaker. Vibration speaker is a new concept of speakers which create sound through the vibration principle. By utilizing the new vibration resonance technology as the speaker transmits sound waves into the solid surface of metal, wood, glass, plastic, porcelain etc. The speaker transforms the surface to a gigantic 360-degree speaker. Connection is simple via Bluetooth. The little speaker weighs in at a third of a kilo, to set firmly on its surface. Features Aluminium Alloy body 3.5mm Audio jack Stream music via Bluetooth Micro USB (Universal Serial Bus) connection Built-in Lithium battery, 3.7V, 800m Ah 10W, DC 5.0V output power Playtime: 2-3 hours Charge time: 2-3 hours Power supply: rechargeable Lithium Ion battery, USB cable, DC 5V adapter Bluetooth test distance Samsung--9 meters Nokia--8 meters HTC--6.5 meters iPhone--9 meters Bluetooth version: CSR 2.1