Brake Sensing Bicycle Tail Light Auto-brightness when braking to warn rear vehicles instantly; enhances visibility and safety for night cycling and commuting. Auto On Off Bike Rear Light Turns off automatically after 40s of stillness and wakes via vibration; saves battery and eliminates manual operation hassle. Exclusive Cartoon IP Bike Accessory WEST BIKING’s self-designed Xiaoqi (cartoon character) & Kaxi (Shiba Inu) – Xiaoqi stands for "Forge Ahead", Kaxi represents "Loyal Guard" to guard your rides. IP66 Waterproof Cycling Light Withstands wind, rain and harsh weather; works reliably for outdoor adventures, daily commutes or long-distance rides. 4 Modes Dual Mounts Tail Light Switches between 4 lighting modes; supports seatpost/saddle rail installation, fitting most bicycles for flexible use. bicycle tail light; bike rear light; brake sensing tail light; cartoon IP bike light; Xiaoqi Kaxi bicycle light; Shiba Inu bike light; auto on off bike rear light; IP66 waterproof bike light; 4 modes bicycle light; dual mounts bike light; night cycling tail light; exclusive cartoon bike light; commuter bike rear light; waterproof cycling light; bike rear safety light; cycling tail light; portable bike rear light; easy install bicycle light; outdoor cycling rear light; rechargeable bike tail light