"Lil 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. No Ordinary Rear Bike Light 18 factories told us Cobber would be impossible. We were happy to prove them wrong. Punchy 50 lumens Compact design Up to 40 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 5 light modes Customize modes with Knog's Modemaker app Compatible with standard & aero seat posts"