Practical Water Resistant Anti Fall Bike Rear Light Bicycle Taillight Lightweight High Brightness Specifications: This bicycle tail light works very well thanks to its smart brake-sensing design. The USB charging design also allows you to charge the light outdoors.With LED beads, this tail light allows you can ride at night with confidence. And the 6 modes design can meet your different needs.It is made of good aluminum alloy and plastic material.The diameter of tail light is 4cm. This taillight is suitable for outdoor riding.Item Name: Bicycle TaillightBattery Voltage: 3.7VBattery Capacity: 420mAh (Battery Included)Charging Time: 1 Hour 40 MinutesFeatures: USB Charging, Portable, Durable, High BrightnessSize Details: Diameter: 4cm/1.57"(Approx.)Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.Package Includes: 1 x Bicycle Taillight 2 x Bandages 1 x User Manual 1 x Data Cable 1 x Base Bracket 2 x Anti-slip Rubber Pads