[ Bike Lights For Team or Family ] These bike tail lights features exclusive patented technology, with a synchronized flashing function that allows all lights of the same model to flash at the same frequency. Perfect for bike teams or family rides, enhancing visibility and adding a touch of fun to your cycling experience. [Smart Brake Sensing for Enhanced Safety] - Experience the advanced safety feature with our bike taillight, as it intuitively switches to high-light mode when braking, emitting an ultra-bright light for 5 seconds, signaling fellow cyclists. Effortlessly install it under the saddle using the metal bracket or on the seat post with the silicone strap, ensuring your visibility and safety during rides. [Versatile Light Modes & High Visibility LED] - Tailor your cycling experience with 4 distinct light modes: Normal Flash, Breathing Flash, Fast Flash, and Steady On. Designed for every cycling enthusiast’s preference and equipped with a high lumen COB LED, this taillight guarantees your visibility, making night rides safer and more enjoyable. [Intelligent Auto On/Off to Conserve Battery] - Our smart bike tail light comes with a motion and light sensor, automatically shutting off after 30 seconds of inactivity and reigniting upon movement or touch. To continually shine during daylight rides, override the light sensor by selecting modes 3 or 4. This feature not only saves battery but also extends your adventures on the road. [Adjustable Brightness & Lasting Battery Life] - Customize the brightness of the rear light up to 120 lumens for a visible 1000m distance, ensuring you're seen by others. With a built-in 400mAh Li-ion battery and the ability to adjust brightness, enjoy up to 50 hours of runtime. Monitor battery life with ease thanks to the four blue indicator lights, each representing 25% battery capacity. [Durable Aluminum Alloy & IPX6 Waterproof] - Crafted from aluminum alloy, our taillight is not only aesthetically pleasing but also durable, waterproof, dustproof, and shockproof, ready for any challenging environment. Our commitment to your satisfaction includes a 12-month warranty, 30-day money-back guarantee, and 24/7 customer service, ensuring a risk-free purchase and lasting visibility on all your rides.