1. BT specifications: BT V5.0 Blue Flood 5335B. 2. Charging voltage: DC5V. Charging time is about 15 minutes (fast charging). 3. Battery capacity: 150mAh. 4. Calls / music time: 20 hours. Standby time: 200 hours. 5. Sizes: 66 * 17 * 25mm. Weight: 10g.