Small speaker. Big sound. Place Twist on almost any surface to turn a small sound into rich room-filling sound. Delivers full range of sound from deep bass to clear vocals. Constructed from aluminum with only one moving part, 10W output power, A2DP Bluetooth for wireless streaming, 3.5mm audio Lithium ion rechargeable battery and up to nine hours of playback time. Includes a carry bag and charge and connect cables. Also includes mount for your speaker. Because glass is a great sound board, it will amplify the already great sound from your speaker. You will also hear the same music on both sides of the window. Constructed from a single piece of aluminum.