LE Rechargeable LED Bike Light, Bicycle Rear Light, 5 Lighting Modes, Cycling Taillight, USB Cable Included Easy to Install. Mounts to any bike quickly and easily, not need any tools. Safety guaranteed: The red light can be used for safety and warning, to keep you safe in every situation with this bicycle taillight. USB Rechargeable. A 630mA lithium-battery and a USB cable is included. Support 5V DC charger adapter (not included), not compatible with adapter over 5V voltage. 5 Lighting Modes: One button to select different lighting modes: Steady on with 4 LEDs, quick flash with 4 LEDs, steady on with 2 HD LEDs, wave flash with 4 LEDs, and slow flash with 2HD LEDs. Super Bright Taillight: This safety light gives extraordinarily wide-beamed RED light, which is compact, slim and lightweight, it's best choice for the night rider or daylight commuter.