Features1Blindingly Bright: Equipped with 61 super-bright LEDs, provides soft and non-glaring illuminating effects, making it produce enough brightness for both daytime and nighttime riding, convenient and practical. 2Brighter When You Brake: The Built-in smart motion sensor, automatically switches to the highest output when you hit the brake, warning the behind drivers, and ensuring maximum visibility and safety. 3Rechargeable \u0026 Waterproof: With a run time of 5 to 50+ hours, the bicycle turn signal can also be charged by the USB port. Made with a waterproof shell, the tail lights are for all weather conditions. 4Easy to Use: Easy to install with the included bracket and magnetic head. Simply mount the light to the bike\u0027s saddle bracket or seat rail and secure it. No additional tools are required. Easy to remove for charging. 5Simple but Mighty: The rear bike light will turn on automatically in low brightness and turn off in high-intensity light to save time. Suitable for all kinds of bicycles, mountain bikes when wandering, or night riding.SpecificationIncrease visibility and safety with our bike brake sensor tail light that creates a larger visibility footprint, making it easier for motorists to spot and gauge your size and distance. Features bright red LEDs, allowing it to function as a front, rear, or turn signal light. Waterproof material ensures reliable performance in any weather. Enjoy more than 50 hours of runtime on battery saver mode before needing a recharge.Features:Blindingly Bright: Equipped with 61 super-bright LEDs, provides soft and non-glaring illuminating effects, making it produce enough brightness for both daytime and nighttime riding, convenient and practical.Brighter When You Brake: The Built-in smart motion sensor, automatically switches to the highest output when you hit the brake, warning the behind drivers, and ensuring maximum visibility and safety.Rechargeable & Waterproof: With a run time of 5 to 50+ hours, the bicycle turn signal can also be charged by the USB port. Made with a waterproof shell, the tail lights are for all weather conditions.Easy to Use: Easy to install with the included bracket and magnetic head. Simply mount the light to the bike's saddle bracket or seat rail and secure it. No additional tools are required. Easy to remove for charging.Simple but Mighty: The rear bike light will turn on automatically in low brightness and turn off in high-intensity light to save time. Suitable for all kinds of bicycles, mountain bikes when wandering, or night riding.Specifications:Color: Red, Blue, Light Green, Black (Optional)Light Color: RedMaterial: Aluminum AlloyCapacity: 500mAhItem Size: 44 * 32mm/1.73 * 1.26inItem Weight: 43g/1.52ozPackage Size: 96 * 63 * 48mm/3.78 * 2.48 * 1.89inPackage Weight: 142g/5.01ozPacking List:1*Tail Light Kit1*USB CablePackage List1*Tail Light Kit1*USB Cable