The Knog Blinder 1 light consists of a very bright led of 20 lumens for the front light and 11 lumens for the rear; That way you are very visible when you go by bicycle. One of its main features is that it does not require batteries, it is rechargeable via an USB built into the light itself. This Knog light weighs only 15 grams and you can easily hook it to the tubes of your bike thanks to its flexible silicone rubber. It has 5 different lighting modes: steady, steady low, strobe, fancy flash and eco flash. You\'ll have around 2 hours battery life if you have the light on in constant mode and up to 11 hours if you take use it in economical flash mode.