Blackburn: Our insanely minimalist Click Light set is incredibly visable to drivers, yet nearly invisible on your bike.A simple 'click' of the lens will power up 2 LEDs that pump out 18 lumens of beautiful, bright light that is even visable from the side of your bike for cross traffic. Simply strong.The silicone mounting strap makes it easy to install/remove and works on pretty much any handlebar or bike frame from 15-35mm.Ingress protection rating or ‘IP Rating’ is a techy way to describe the level of water and dust-proofness a product has.This light meets the IP-65 Standard, which means it is totally protected against dust/grit and fully resists strong jets of water from all directions.Two CR2032 coin cell batteries are included and are super-easy to replace.  SPECSProduct Weight37 grams (front 17g, rear 20g)ANSI StandardThis standard was created by the American National Standards Institute (ANSI) to provide consistent performance measurements for handheld lights.Brightness20 lumens front, 4 lumens rearRun Time Steady mode: front 70 hours at 20 lumens, rear 70 hours at 4 lumensFlash mode: front and rear 130 hours at 4 lumensWater Resistance IP-65 submersible - Ingress protection rating or IP Rating, is a techy way to describe the level of water- and dust-proofness of a product. This light meets the IP-65 Standard, which means it is totally protected against dust/grit and protected against low-pressure water jets from any direction.Mounting OptionsVersatile silicone mounting system fits diameters 15–35mm, No tools requiredPower Source2 CR2032 coin cell batteries for each lightWarranty2-Year Warranty Provision for Battery Or Electrically Powered Products, Product Components, and Accessories for Such Products