I previously posted a very positive review of this product. Within the last few weeks, my riding partner has noticed that my rear light, when activated, only stays on for about 10 minutes and then dies. I have always always made sure this light was fully charged before every ride, and that the charge light was "green." I have had to scrap this light, and buy another. It is a shame, because I liked everything about this light: the design of the strap, the lumens produced, and the ease of operation. I can't say that you or anyone else will experience this problem, but disregard my prior positive review.
I purchased this item to replace a competitors rear light as the rechargeable battery was not holding charge. I was taken by the run time advertised for this item and after use I am disappointed in the actual time the charge lasts. I have tried several modes and seemingly cannot get more than 2.5 hours. I personally consider the engineering/design to be rather strange. When placed in a USB slot (the only means of charging) the indicator light is on the bottom and facing the computer, requiring one to either contort your neck and head or use a mirror to determine if the light has gone from red to green. Knog needs to seriously re-engineer this product.
Every time I have to share the road with cars - day or night, I make sure my rear Knog Blinder is activated. It is very, very bright and definitely adds to my visibility (and hopefully safety) on the road. The Knog comes with three different sized bands, and has a very smartly designed clip that allows easy installation and removal. I feel safer on the road with this light.
My riding partner has this light so I can see the distance that it is useful. It stays charged for several rides at low blink. Quite impressive. Easy to charge. I have a charging station with 10 USB holes that is perfect for all our lights and GPS. Knog and otherwise.