1. Bluetooth 5.0, more stable and faster connection. 2. Fast seconds, Bluetooth 5.0, automatic seconds, with headphones can be used 3. Light, comfortable to wear, free to adjust, not easy to fall off 4. 3.5-4 hours working time per charge for the earbuds, 5-6 times full charge by the charging case. 5. Comfort fit & wide compatibility. Different sized ear tips and in-canel cable-free design provide comfortable fit. Support Bluetooth-enabled devices with version 4.0 and above. 6. Exercise ready: Sweat-resistant with a secure fit thats made to move with you. Specification: Packing list 2*Bluetooth Earphone 1*USB Charging Cable 1*Charging Case 1*User Manual