I bought 4 lamps in various colors for additional illumination of my bicycle. The silicone lights are light and easy to install (almost all bicycle racks are suitable), the batteries need to be supplied and the operation is very simple. In addition, they are protected by the silicone housing water and dirt repellent (hold even stronger rain easily stand). The different lighting modes (continuous light, fast or slow flashing) can shed light on the bike in addition to more attention of motorists and thus achieve more security. The lights are also suitable for dogs (when walking the dog in the dark), but also for children's bicycles, scooters and strollers. The maximum burn time with a battery, I could not test, but the price-performance ratio is super.