Description: Adjustable Lighting: The Bike rear light has 3 levels of brightness lighting modes, a bike tail light with LED, and a bright brake light to make you more visible to other road users. Built in 260mAh battery, comes with USB cable.Smart Brake Sensing: Accurately identify and detect brakes, The lights will be bright for 3 seconds, and will automatically turn off after 30second of being still. When bike moving is detected, the taillight will be automatically turned on.Premium Material: The Bicycle rear light is made of ABS Plastic, PC material, IPX6 waterproof, rainproof, shockproof, and dustproof, durable, high quality material makes it sturdy and durable, suitable for level roads, potholes, and muddy roads.Easy to Install: The bike tail light comes with a strap and 4pcs cable ties, it can be easily clamped and firmly fixed. Do not worry about bicycle lights falling in collisions, it is a perfect bike warning light for night riding.Widely Used: LED Bike brake sensing rear light can be installed under the saddle with the mounted bracket or be installed to the seat post with an adjustable silicone strap. It is suitable for road bikes, cruisers, folding bikes, mountain bikes, etc. Specification: Material: ABS Plastic PCHeight: 3.3cm/1.30inchWidth: 3cm/1.18inch Package Includes: 1pcs Bike Rear Light1pcs Strap1pcs USB Charging Cable1pcs Tube Bracket Silicone Pad1pcs Tube Mounted Bracket4pcs Cable Ties1pcs Saddle Mounted Bracket Note: Please allow slightly errors due to manual measurement and different monitors.