LED Bike Tail Light Ultra Bright USB Rechargeable Waterproof Cycling Brake Light for Mountain Road Bikes High lumen COB Led Enhance Your Safety: With best COB leds and smart sensors,ultra bright brake light,daytime strobe make you more visible for other road users.It is easier to additionally improve your safety in riding.<br> Auto On/Off Makes Your Riding Safety More Effective, Easy and SimpleSmart flash and breathing lights automatically turn on when moving or vibrating, otherwise they turn off . Super bright braking light promptly provide warning people behind.<br> Light Sensing Make Your Riding More Convenient: The rear bike light with intelligent sensor, flashing lights turn on automatically in low brightness and turn off in high-intensity light. Save your time to switch the bike tail light<br> Long Llife Battery and IPX6 Waterproof: Built-in safe and durable USB rechargeable polymer lithium battery, the rear bike light run time can be up to 60 hours. IPX6 waterproof grade makes it easy to use the bicycle tail light in any weather.<br> Easy Mount and Removable: Saddle mounting bracket and adjustable silicone strap provided, make the bicycle rear light flexible to quick install or detatch on bicycles. Very convenient to rotate out from the bracket for recharging