Description: Features: brand new and high quality Fits virtually any sized road bike and mount it anywhere you like. These tail lights are water resistant, and extremely durable. Multi-functional: Lightweight and durable. It also can be used as helmet lights, backpack lights, warning lights and more. IP65 grade waterproof material to ensure a safe use even in heavy rain. Conveniently recharge with the micro-USB cable. Quick mount without any tools. Installs easily on handlebars, for seat posts, helmets, also can hook onto your running gear, reflective vest, backpack, or anywhere. Specification: Material: ABS Color: Black+White Waterproof grade: IP65 Power supply: USB cahrging Size: app. 4x4x2.3cm(1.57x1.57x0.90in) Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Bike Rear Light(other accessories demo in the picture is not included.)