Features: brand new and high quality Unique smiling-face-design, the lamp body is equipped with a safety reflector design. Simple rubber band design makes installation and disassembly more convenient. 3.7V 500mAH USB rechargeable lithium battery model, which can be charged by the commonly used charging cable. The red light is on when charging, the green light is on when fully charged, and the continuous working for time is 5-8H. Long press the switch for 3 seconds to turn on/off the power; short press the light to switch modes, there are 4 modes: constant light, flashing, strobe flashing, and breathing flashing; when the bicycle is stopped for 20 seconds, the light automatically goes out. Specifications: Material：ABS Color：Red/White Size：6x4.6cm/2.36x1.81in Package Includes: 1x Tail Light, 1xUSB Cable, 2x Rubber Ring. note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!