LONG-LASTING BATTERY LIFE, THE BUILT-IN 6000MAH BATTERY CAN PROVIDE AN ADDITIONAL 3 HOURS OF BATTERY LIFE, CHARGING DIGITAL DISPLAY REMINDER FUNCTION, AND THE DIGITAL DISPLAY WILL BE TURNED OFF AFTER 30 SECONDS AFTER POWER-OFF.Two adjustment methods, rotary type and on type adjustment, multi-angle adjustment, easy to fit the head.ABS shell + sponge cushion, high-strength material, durable and wear-resistant.Soft memory foam pad with adjustable elasticity.The structure is precise and easy to install.