Features 1、Up to 200 lumens brightness offers good visibility and ensure your safety when riding at night. 2、3 lighting modes switchable: Long bright, Flash, Slow flash. 3、Each light runs on 2 CR2032 cell batteries, with long battery life up to 8-15 hours. 4、Made from aluminum alloy and ABS material, weather-resistant and durable. 5、Adjustable rubber band for tool-free installation, can be mounted on seatpost, handlebar, seat stay, front fork. Features: Up to 200 lumens brightness offers good visibility and ensure your safety when riding at night. 3 lighting modes switchable: Long bright, Flash, Slow flash. Each light runs on 2 CR2032 cell batteries, with long battery life up to 8-15 hours. Made from aluminum alloy and ABS material, weather-resistant and durable. Adjustable rubber band for tool-free installation, can be mounted on seatpost, handlebar, seat stay, front fork. Specifications: Material: Aluminium alloy + ABS Light Mode: Long bright, Flash, Slow flash Brightness: 200 lumen Endurance: 8 - 15h Unit Size: 27.5 * 26 mm / 1.1 * 1.0 in Unit Weight: 20 g / 0.7 oz Package List: 1* Bike Light Package List 1* Bike Light