【Intelligent Brake Sensing】This smart taillight automatically brightens when braking, enhancing visibility and safety for cyclists. 【8 Light Modes】Featuring 68 COB LED chips, the taillight offers 8 versatile lighting modes to suit various riding conditions and preferences. 【Motion Activated】The light turns off automatically after 20 seconds of inactivity, conserving battery, and reactivates instantly upon detecting movement. 【Weatherproof Design】With an IP65 waterproof rating, this taillight is built to withstand various weather conditions, ensuring reliable performance. 【Dual Mounting Options】Includes both seatpost and saddle mounts for flexible installation on different bike types. 【Extended Battery Life】The 500mAh polymer battery provides 3-30 hours of runtime, with a low-battery mode that switches to a flashing pattern for prolonged use. 【High Visibility】Emits up to 120 lumens of red light, significantly improving cyclist visibility to other road users. Specifications: Material: PC Charging Port: Type-C Waterproof Rating: IP65 Weight: Approx. 32.5g (without bracket) Mounting Options: Seatpost bracket + Saddle bracket Battery: 500mAh polymer lithium battery Maximum Brightness: 120 lumens (red light) LED Type: 68 COB LED chips Charging Time: 2 hours Runtime: 3-30 hours Light Modes: 8 different modes Features: Mode memory, Motion sensing, Brake sensing