Builtin rechargeable battery with USB charging: eliminates the need to batteries; USB charging enables fast, convenient recharging so the device is ready when you need it. Buckletype bracket for easy installation: quick, secure mounting that stays firmly in place and is resistant to loosening during rides. Waterproof performance: designed to operate reliably in wet or damp environments, suitable for a variety of riding conditions. brightness LED beads: provides strong illumination to improve rider visibility in lowlight or dim environments. Use scenario 1: urban night commute. Provides bright, reliable forward illumination and enhanced visibility to other road users on dark city streets. Use scenario 2: offroad or trail riding in low light. Helps you see uneven terrain clearly while increasing your presence to others. Use scenario 3: riding in rain or adverse weather. The waterproof design maintains performance and continues to illuminate your path in wet conditions.