It can fall off.
Very cool piece. It's leather so it keeps the wife in a constant state or arousal. And it's got fairly strong magnet on either end, so if you need to pick up some metal from a tight space, like car key between the seat and the console, or nut that fell into that hard to reach spot on a hot engine block you are good to go. The first one I bought was an 18 incher. I probably should have got the 20 because it was about a half inch tighter than I wanted, and it did tend to undo when bench pressing, or sliding adventure gear over my shoulders (rifles, crossbows, back packs, etc.). The necklace came off somewhere in Moab and it's probably still waiting on the ground for the next lucky owner. So I bought a 20 to replace it and haven't had any repeat problems.
Rating: 4 stars