Solar Charging : Built in intelligent chip, stable current control, battery protection Bluetooth 5.0 : Automatic connection, faster connection, connection range upto 10m Sweatproof : Effectively prevent the infiltration of sweat, and prolonged sevice life Free Switch : Connect two headsets at the same time, or connect with single ear Hifi Sound : Built in high fidelity composite diaphragm unit, enjoy music Long Endurance : Large capacity battery, longer service time, enjoy listening to songs or watching movies Touch Control : Sensitive easy to operate, controlled by gentle touch Strong Compatibility : Compatible with most smart devices with bluetooth function Charging Box Capacity : 300mAh Headphone Capacity : 30mAh Standby Time : 55 Hours Use Time : 4 Hours