describe: 1. Material: high-quality ABS material, lightweight and durable, with excellent thermal conductivity. 2. Lamp beads: 4 high-brightness lamp beads with optical lenses, effectively keeping the light transparent, bright and not dazzling. 3. Charging method: USB smart charging, compatible with a variety of charging methods, notebook, computer, car and other charging methods, which can be charged anytime, anywhere. 4. Light mode: 4 light modes (strong light/low light/slow flash/strobe) to achieve the best visibility during the day and night. 5. Convenient installation: It can be easily tightened and fixed without any tools. 6. Suitable for: various sizes of bicycle seatposts, handlebars, seat cushions, backpacks, helmets and pets. It is a perfect gift for family and friends. . Specification: Name: USB rechargeable bicycle front light and tail light group Color: white (front light)/red (tail light) Light source: 4*LED Charging method: USB charging Battery capacity: built-in lithium battery Battery capacity: 350mah Charging time: 2.5-3h Working time: 5-6h Light mode: 4 light modes (strong light/low light/slow flash/strobe) Waterproof rating: IPX4 Size: 40*24mm Weight: 52g type of packaging: Tip: 1. Due to manual measurement, please understand the error of 1-3 cm. 2. Due to the difference of light and screen, the color of the product may be slightly different from the picture.