YHSQV-High Lumen COB LED Improves Your Safety: With best COB LEDs and smart sensors, ultra-bright brake lights, daytime strobe makes you more visible to other road users. It's easier to further improve your safety while cycling.Automatic On/Off Makes Your Cycling Safety More Efficient, Simple and Smooth: Smart flashing and pulsating lights turn on automatically when moving or vibrating, otherwise they turn off. Super bright brake light immediately warns people behind.Light Sensing Makes Your Cycling More Convenient: The bike taillight with intelligent sensor, flashing light turns on automatically in low light and turns off in high-intensity light. Save time turning the bike taillight on and off.Long Life Battery and IPX6 Waterproof: Built-in safe and durable USB rechargeable polymer lithium battery, the bike taillight can be used for up to 60 hours. IPX6 waterproof rating makes it easy to use the bike taillight in all weather conditions.Easy Installation and Removal: Saddle mounting bracket and adjustable silicone strap included, making the bike taillight flexible for quick installation or removal on bikes. Very convenient to rotate out of the bracket for charging.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications.We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please do not hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it!