Description: Not only can cars have turn signal light, so does your bike if you have 1 pair of our product. Made of super light material which is durable and solid, install them on your handlebar, a little press for warning other vehicles, you are worth it! Specification: Main Material: Aluminum Alloy Color: Black, Red, Blue, White, Yellow (Optional) Life Span: 100000 Hours Lighting Angle: 270° Visible Lighting Distance: 20m / 65.61" Light Color: Red Modes: Constant On and Flash Battery: 2 x LR1130/AG10 Batteries (Included) Suitable for: Handlebar Tube at a Diameter of 16-23mm / 0.63"-0.90" Package Weight: approx. 50g Quantity: 2pcs Package Includes: 2 x Handlebar Safety Warning Lights Friendly Tips: 1. When installing the bike handlebar LED lights into the standard bicycle handlebar ends, you can tighten the nut to adjust the diameter of the rubber ball, and then squeeze the lamps to the holes of the handlebars ends clockwise. Remove the lamps anti-clockwise when pulling out. 2. Some of the handlebars holes may be relatively large, you can wrap the rubber ball with tape a few times and then set into it.