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!Features: Constructed by high quality material which is super light, durable and solid to use.Lifespan is up to 100000 hours, 270 large lighting angle, 20m visible lighting distance.2 modes, constant on and flash.Available in 5 shell colors for you to choose.When you are going to make a turn, light on to warn other vehicle or bikes for safe riding, especially working great at night.Suitable for bicycle handlebar at a diameter of 16-23mm or 0.63inch - 0.90inch.Specification:Main Material: Aluminum AlloyColor: Black, Red, Blue, White, Yellow (Optional)Life Span: 100000 HoursLighting Angle: 270Visible Lighting Distance: 20m or 65.61"Light Color: RedModes: Constant On and FlashBattery: 2 x LR1130 or AG10 Batteries (Included)Suitable for: Handlebar Tube at a Diameter of 16-23mm or 0.63"-0.90"Package Weight: approx. 50gQuantity: 2pcsPackage Includes:2 x Handlebar Safety Warning LightsFriendly 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.