Latest bluetooth version V5.0 makes more quickly and stable connection. 500mAh Long battery life up to 18 hours music time. Charing full only in 2.5 hours. Oval-shaped earpieces are more comfortable than the small round or heart-shaped ones in the market. Bluetooth Version: 5.0 Range: 33 feet (10 meters) Talking Time: Around 25 hours Music Time: Around 18 hours Charging Time: 2.5 hours Charging Voltage: 5V Battery Capacity: 500mAhv