This ActionAir Hitme interactive lighting and music play toy is a must have!! These are a huge hit with my boys. They come in a pack of three and are very easy to put together. There are straps that each light goes in to. They actually twist into the strap and tighten down completely which is terrific, so no worries of them falling out. The straps are perfect for going around a bounce house and will adjust to fit any of them. These will actually stay put and won't fall off. The string that wraps around goes into the other end piece that keeps it locked into place. Also, these are super easy to attach, only took a few minutes to put all three on. Next, they have 3 different flashing lights and 3 mini songs. The lights change from red, green, and blue and you can tap them to change the music. Each light requires 3AAA batteries. Lastly, the overall quality of these is outstanding!! If your little ones have a bounce house these are a must have!! My boys have played with them nonstop, it really takes bounce houses to the next level!