Equipped with advanced sensors, this bike rear light automatically brightens when is detected, enhancing visibility and safety during night rides. With an IPX6 waterproof rating, this bike lamp is designed to withstand adverse weather conditions, making it suitable for all-season cycling. The robust ABS body material ensures durability and resistance to impact, ensuring your tail light stays intact even on rough terrains. Features 5 to 8 adjustable brightness settings, allowing you to customize the intensity according to different cycling environments and battery life conservation. This tail light is designed for easy mounting on the bike's handlebar, providing a secure fit and ensuring the light remains stable during rides. Powered by batteries, this tail light is built for extended use between charges. It is perfect for long-distance cyclists and those who prefer not to worry about frequent recharging, providing reliable illumination throughout your journeys. Waterproof Level:IPX 6 Host built-in battery: 3.7V250 mAh polymer battery Battery life: about 6-40 hours Charging input: USB Type-C charging Colour:Black Material:PC+ABS Package Contents: 1*taillight + 1* charging cable + 4*brackets + 2 *straps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.