Brand Name:novaPower Supply:BatteryMounting Placement:FrameCertification:CEModel Number:qs0038Bulb:Red LEDBattery Type:CR1025 batteryRunning Time:constantly 50 hoursBulb : Red LEDIt flashes while you brake;Rainproof;Use an adjustable stainless steel leaf spring switch;Can be fixed on sidepull caliper brake， V-brake;Use a CR1025 battery;Running Time: constantly 50 hours;With small size and light weight， can be easily installed on the brake without using any tool.It can be installed on the V-brake of mountain bike or sidepull caliper brake of racing bike.With stainless steel leaf spring switch，brake light can be installed on a variety of brakes without affecting the braking performance; Packing Include:1 x Bike Brake Light