Description of Princeton Tec Switchback 3 Bike Light Inspired by the race scene, the Switchback 1 was designed to be the smallest and most powerful LED helmet light possible to partner with high output primary light sets. In the end, we made a tiny, super hero of a light with unmatched performance that is not only the perfect secondary light, but a light that can cross from urban to freeride to cross country in a single beam Features: Up to 10 hour burn time Lithium ion rechargable battery 436g Regulated LEDs that won't begin to dim immediately like other LEDs Oversize buttons so you won't miss a beat, or corner, adjusting your light Heat guard around buttons to dissipate heat Die cast aluminum alloy that provides excellent heat dissipation, strength and durability for trail riding Cooling fins keep the unit temperature down Waterproof grommet and seals around the button provide water resistance to splashings and brief (unexpected) dunkings Handlebar mount Quick release tab on the handlebar and helmet makes it simple to install and remove the head unit