I bought two a few hours ago to put them on the back wheel, I installed them and took a ride to test them and they were shining quite well. Their functions are fourfold (they move back and forth with two different combinations as soon as the 1st opens and on the 3rd press the 2nd, second press is flickering, fourth press is steady, they turn on/off for a long time). The funny thing is that they make us look like a patrol car (at least the combinations remind me of that). In the package, there are 2 tires (small/large) to put them wherever you want on the bike and the only downside is that they have a 20cm charging cable and not a longer one (fortunately, I have a few). Oh, I almost forgot, one of the two packages I bought had one large tire, so I took a regular tire that they put in the packages of deli products at the supermarket, I doubled it and put it on the bike, and there was no damage at all! With the test that was done, they passed with flying colors, and it will be seen over time how long they will last. Note 1: Video with their functions, the lights look like mini-minion patrol car headlights... Note 2: One photo showing where they are placed (I mention it in the review) and one with the tire (which I also mention) in case it is missing from the package and if any are lost, so you have an idea of how it should be installed.