I chose this set of lights because the lights are each in a silicone case, the price is very good and the illumination is decent. That way if I drop one, it’s protected better than a cheap plastic cover. Thses lights have fairly strong white LED illumination and modes for a solid red light or blinking red lights. I usually tuck this light into the top of my shorts on my backside and put it on flashing red when it’s dark. The magnets keep it in place when I am moving. I have never had one of these lights drop off as long as the magnets are securing it. Before this pair, I had already been using a slightly larger LED light which I tuck in to the front of my shorts to illuminate my path in the dark. Together, pure white light in front and this in flashing red mode in back, I have the best combination. I feel pretty safe when I have both lights (and a can of mace clipped on) when it’s dark out. I have noticed that cars see me quite well and move over hundreds of feet ahead of me for that part of my routine where I am forced to be on the road. I took off one star because the silicone case is open on one side. It would be better if it were fully enclosed with one side having a small flap for the charger (USB). To charge these lights by USB, I have to push them out the one side of their silicone case that is open to gain access to their charging ports. All in all, these are still really small light weight lights that throw out a lot of light and are really easy and useful. I have even clipped them onto the front and back of my son’s bike since the magnet hold them so well in place and they kick out a lot of light.