Specifications Bluetooth version: 4.1 Standby time: 300-320 hours Transmission distance: 10M Charging voltage: DC 5V Talk time: 8-9 hours Battery capacity: 150mAh Charging time: about 2 hours  Package 1x Bluetooth headset 1x USB charging 1x 3.5mm Jack Audio Cable 4x Ear Tip 1x Manual