Kasstino Waterproof Bike Bicycle Cycling 5 LED Night Safety Flashing Rear Tail Light Lamp The rear light reflects well in the night so it could secure your safety in bad weather. With low power consumption, it provides power as long as 150 hours. Its effctive range reaches 800m. Additionally it's waterproof and can be switched between steady light and flashing light with the touch of a button! Easy to install and remove, it is a very powerful and practical light. This lights is energy saving,please use with ordinary carbon-zinc batteries, do not use high-power high-energy alkaline batteries, the high-power high-energy alkaline batteries easily burn tent lights.