The Double-Back Light from Brunton Outdoor is a do-it-all little LED light with limitless possibilities. It features a flexible strap that can be wrapped around a bike seat post or handlebars, tent poles, tree branches, walking stick, backpack D-rings--pretty much anywhere you want it to go for signaling, emergencies (it has a built-in Emergency Flash Mode), or just plain lighting. The twin LED bulbs can deliver a steady or blinking 20 lumens of illumination for up to 80 hours. It operates using two CR2025 batteries, which are included.