Waterproof Bike Bicycle Rear Tail LED Helmet Cycling FlashLight Safety Warning Lamp Cycling Safety Warning Light with BatteryFeature:1.INCREASE YOUR SAFETY: The high-powered output will increase your visibility to the vehicles surround you in the dark. Visible 180 degrees, meaning the light is not only visible from the rear, but on both sides.2.LIGHT EVERYTHING YOU OWN: Universal Mount. Fits any sized seat post or bike frame, 3 Strapping Sizes. Elastic Rubber stretchable to fit on almost anything! This light can be strapped on your helmet, backpack, bicycle seat post, back bike rack, stroller, and your pet's collar. Be creative and strap it on anywhere.3.SAVE TIME & FRUSTRATION: No tools required. Conveniently strap-on in seconds on the go and remove in seconds when parked4.RELIABILITY KEEPS YOU ON THE ROAD: Water & Shock Proof - Runs on 2 X CR2032 Batteries & Features 3 Light modes: Solid, Fast-Strobe, Slow-Strobe5.MULTI-FUNCTIONS FOR DIFFERENT APPLICATION: BIKE Headlight and Taillight Set-Headlight is with Headband which is perfect for BIKING /HIKING/RUNNING,Walking/BABY CAR6.Multi-fit rubber strap-n-clip system allows for easy connection on and off handle bars 22-32mm, seat post or frame tubes 10-32mmSpecificaiton:Powered by: 2 x CR2032 batteries (included,you don't need buy battery again)Diameter of lamp holder: 2cmLength of silicone belt: 9.8 cmWorking Time: 50-160hoursPackage:1 * Bicycle Light