Sometimes my wallet will slide out of my pants pocket when I am in the , well you know where, and Ihave notice it and paniced. So one is in there. Oddly of all the tags i have it is the only one with a slightly lower battery. I also have one on the dog leash, wife purse, my keys and the TV control. I have an extra and would love to drop it in my kids boyfriends car, but probably won't.