1.top quality,fashion appearance. 2.high fidelity sound. 3.d-class amplifier. 4.multimedia devices compat cheap waterproof bluetooth speaker ... Specifications: 1. built-in lithium battery voltage: 3.7 V 2. Lithium battery capacity: 500 mAh3. Charge ... EDR, Bluetooth speaker: 10M 10. Vibration,Without handfree phone 11. 3.5mm Audio Cable Built in,support iPod,iPhone,iPad etc ...