It’s time to improve your safety factor when you ride your bicycle at night with our super bright tail light! It is not only a safe helper but also a beautiful decoration when using in the evening. Specification: High quality and super bright LED 4 Casing colors for choosing, as picture shows Durable,waterproof & fine workmanship Quick and easy installation with silicone lamp band. Press the lamp, it will be lit up, and press it again, it will change the lighting mode. Easy to install Mode:flashing & steady on Battery: 2x CR2032 button cells (included) Lighting color optional: red or White for choosing Silicone band total length: approx 10cm (un-stretched state) Material: aluminum alloy casing & silicone band Tail light size: approx 3.5*3cm (D*H) Package: 1x bike tail light ( with 2 button cells)