Suitable For Most Bikes: Comes With An Adjustable, Easy To Install Clamp, Which Is Suitable For 20-31Mm Diameter Tubes. The Bicycle Tail Light Can Be Installed In Virtually Any Bicycle Frame, Seat Pad Support, Fork, After Fork, Backpack, Helmet Use. Super Bright 7 Lighting Modes: Steady Light - Slow Light - Fast Light - Slow Cycle Flash - Fast Cycle Flash - Right To Left Flash - Left To Right Flash. Fluorescent Light Design Reminds Someone Else To Keep Their Distance And Ensure Your Safety When Riding In The Dark. Fluorescent Emitter Led Indicators Work At The Same Time. Waterproof Bike Taillight: 100% Brand New And High Quality, The Bike Taillight Meets Ipx-Ii Waterproof Standard, Tilt Raindrops At 15 Degrees. Safer In Water Mist When Riding In The Rain. Durable And Portable: The Bicycle Safety Warning Light Made Of Abs + Acrylic, Which Is Durable, Compact And Lightweight, Easy To Carry, Ultra Luminous To Protect You, It Is A Great Gift For Your Bike. Powered By 2 Aa Batteries. (Not Included) Multifunctional Bicycle Safety Light: The Bicycle Taillight Was Designed To Enhance Night Riding Safety And Cycling Entertainment. Suitable For Cycling, Mountain Bikes, Road Bikes, Folding Car, Jogging, Walking, Road Emergency, Camping, Etc.