The magnet is a very dumb device. It can fly off with a hard hit, a small branch, bush, or just waving at your friends wife.
I tossed mine right away and run a real teather and a kill switch. The NATC has changed the rule from being a wrist strap device. I prefer it attached at the waist. No accidental fives and I am hands free.
My bikes on the left and I changed the strap out to a short red one. I cand buy the lanyards online 2 for 10 dollars.