Features: USB Rechargeable:The bicycles taillight is built on a 1200mAh large capacity rechargeable lithium battery. After fully charged, it can work continuously for 4 hours. 6 Light Modes Optional: The bike tail light has 6 different light modes; Flashing modes make you visible even on the busy road or dark routes. Simple Installation: The taillight strap fit most seatposts. And it is very widely used, including helmet, scooter, wheelchair, skateboard, backpack, etc. Safety: The IPX4 waterproof bike rear light can be used in rainy day, and equipped with LEDs that provide bright light, make your ride safety. Service: Your satisfaction is our priority. If you are not satisfied with our product or have any questions, please feel free to contact our. Specifications: Material: ABS/PC Color: As The Picture Shows Package Weight: approx.100g Size: approx.10.4x3.6x3.5cm/4.09x1.41x1.37in (More Size Detail, Please See Photo.) Package Includes: 1 Set of Bicycles Tail Light note: Please allow 1-2cm error due to manual measurement. Please 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. Thanks!