Im very happy with the way these pair up so quickly. It also has a panic button which can be used in emergency and send your location to someone if you need help which I have tested and works as expected. This was a Christmas gift, he loved them! While I dont like bully romance and I was completely stressed all throughout this book because I was so nervous for my girls, the story is compelling I am very interested in seeing if the twins can come out on top. It does glow in the dark but of course not like a light bulb and has to be exposed to direct light before that. Im a heavy guy and with just the stock factory inserts that come with these- Im comfortable, I normally wear an aggressive arch support to combat plantars fasciitis - yet these dont cause the plantars to become inflamed/torn. Sad that they didn?t work. It?s metal so it?s very sturdy. I?ve tried organic bamboo swabs and they snapped in half while in use so that was a huge disappointment. Why put a tightening screw in a place you cant get to??? One of those frustrating things and the directions even say dont tighten unt you get the bars balanced.