Installation: pull the loop up where you need it and then push the battery pack through. Don’t try to stretch the loop over the battery pack while holding the battery pack in place. You will need zip ties or tape, the clips on the edge of the light strips will not last. That said, I actually love these lights. They function as described. The entire wheel lights up with fairly complete coverage at a fairly low speed. You can opt for solid, flashing, or changing fancy-pants patterns—something for everyone. If they fail in a short period of time, I will change my review, but I feel like these lights are the best option for night riding.