【 Warm Reminder 】 This lamp uses 2 AA batteries. The lamp does not include batteries. 【 Dimensions 】 Approximately 7.5 * 4.5 * 3.5 centimeters 【 Instructions for Use 】 The switch is controlled by a single button on the back. Additionally, there is a clip (clamp) on the back that can be attached to bicycles, belts, shoulders, backpacks, schoolbags and other personal items to serve as a safety warning The bicycle features a 9-LED taillight with 9 red LED beads inside This lamp is suitable for installation on bicycles with a pipe diameter of less than 33mm, and can also be hung on bike bags with light strips for use. It can be opened with a 10-cent coin to install two AA batteries (please bring your own). ● Seven flashing modes, quick-release design, waterproof and shockproof, especially suitable for friends who enjoy off-roading and night cycling, ensuring your personal safety. The flash mode is: Press once: 9 lights remain on Second part: All nine lights flash rapidly The third part: The nine lights flashed slowly and simultaneously The fourth to the seventh: The nine lights flash in different directions in a rolling manner Part Eight: Close