1. Metal Shell, feels great to the touch and increases the sound quality. 2. Can play for 4-5 hours (depends on your volume). 3. Excellent Bass, has two drivers in front and two in the back, the structure offers xBass sound. 4. Bluetooth CSR4.0.Instantly connects your phone or tablet from up to 33 feet away. Speaker automatically reconnects to the last device used. Compact size lets you easily move it around from room to room.