The Knog Big Cobber rear light produces an incredible 330º of light, so you\'ll be clearly seen from all angles. In an increasingly busy world, this bike light is brilliantly effective at attracting attention and helping keep you safe on the road. Packing 270 lumens this Big Cobber is seriously bright.The Cobber has integrated USB recharging, is 100% waterproof and you can programme the settings using ModeMaker.The ModeMaker app allows you to design the modes for any PWR bike light. Simply plug in your light, then select and tailor modes from the menu. You can do things such as control brightness, adjust runtimes and add new light modes.