Features1Long Endurance: This bicycle rear light has a built in high capacity lithium battery and the blue light shows the power. The endurance is up to 815 hours. The endurance time is different in different modes. 2Durable: The bicycle rear cycling safety flashlight is made of ABS plastic material, which is sturdy and durable. And the material is sunscreen. 3USB Charging: The warning back bicycle flashlight can use USB charging, such as mobile power charging, charger charging, which is convenient and fast. 4Portable: This LED bike tail light is small and light, which is easy to carry. And the light has the effect of waterproof, so you do not have to be afraid of a light rain when you need to go out. 5Easy to Use: The tail light of this bicycle can be rotated 360 degrees, and the angle can be adjusted according to needs. Moreover, the light has a remote control function, which is more convenient to operate.SpecificationItem Type: Bicycle rear lightMaterial: ABS plasticWeight: Approx. 255g/9ozTail Light Battery: Lithium battery 2400mAh(Shipped with built in battery)Remote Control Battery: 1pc CR2032 button battery 210mAh(Shipped with built in battery)Charging Mode: Type CGear: 1. Turn on the light(All tail lights are normally on at half power)2. Horse running (The left and right sides run continuously from the inside out. If there is no other operation, it will be a long term cycle)3. Flashing(All lights flash at full power with an interval of 0.5 seconds)4. All LEDs are on at full power.Package List1 xBicycleRearLight1 x Remote Control1 x Bandage1 x Fixing Bracket1 x Data Line1 x Instructions in Chinese and English