Red light is the farthest transmission band in the spectrum, so we can see red objects far away, and because of the strong penetrating power of red light, it is also eye-catching in fog and rain. Built-in 420mAh battery, long battery life up to 25 hours, escort your safety. It is easy to use because the product is with the adoption of minimalistic design. Undoubted that its compact size and lightweight body ensure the product features with portable. It features with 180-degree wide-angle light, lens lampshade, battery indicator, IPX5 waterproof functions. It is made of ABS and PC material. The total length of bicycle tail lamp is 110mm and the length of lamp is 33mm. Rear lights are suitable for escorting night riding. Item Name: Bicycle Tail Lamp Material: ABS, PC Battery Capacity: 420mAh Features: Convenient, Lightweight, Long Lifespan Size Details: Bicycle Tail Lamp Total Length: 11cm/4.33" (Approx.) Lamp Length: 3.3cm/1.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Type N20L: 1 x Bicycle Tail Lamp 1 x Data Cable or Type F20L: 2 x Bicycle Tail Lamps (2 Styles) 2 x Data Cables