Material and process: 6061 ultra light aluminum alloy, CNC integrated molding Glow color: red light Using two batteries: LR1130/AG10 Features: 100000 hours of ultra long lifespan LED, 270 degree wide range viewing angle, visible from a distance of 20 meters, effectively ensuring cycling safety Scope of application: Suitable for handlebars with a pipe plug range of 16-23mm inner diameter; Installation instructions: Tighten the nut, flatten the rubber ball, and adjust the diameter size. Then directly insert it into the holes at both ends of the handlebar. Applicable environment: When turning a bicycle, turn on the turn signal to warn road vehicles and ensure cycling safety. Riding at night is more effective. Function: Press the white rubber lampshade to light up, with two modes of constant light and flashing