Be safe and seen with this intelligent red rear bike light. There’s no need to turn on the light, it works automatically by identifying darkness and vibration when you are riding. It also turns off automatically in 120 seconds after parking. It’s very safe for night riding with a visible distance of more than 200 meters. It is also IPX3 waterproof, has a visual angle 220-degree horizontal. There are two modes: dim and bright.It’s also easy to install using the included silicon strap and has 12 hours working time. The light is powered by 2 x AAA batteries (not included). SpecificationsVisual angle: 220 degree horizontalIPX3 waterproof ratingDimensions: 66 x 44 x 36mmWhat's included 1 x Rear LED light 1 x Silicone elastic strap 1 x Non-slip 3M silicon gasket 1 x User manual