"Mid Cobber produces an incredible 330° of light, so you’ll be clearly seen from behind as well as from both sides. It’s brilliantly effective at attracting attention day and night, making it one of the safest rear bike lights you could choose. 18 factories told us Cobber would be impossible. We were happy to prove them wrong. Powerfully bright 170 lumens Up to 100 hr runtime Incredible 330° beam angle Quick mount release Waterproof to 3 ft with an IP67 rating USB rechargeable, cable-free charging Pre-programmed with 8 light modes Customize modes with Knog's Modemaker app Compatible with standard & aero seat posts"