Gun Leash functions similarly to a door contact on an alarm system that detects when the door is open or closed. Gun Leash is capable of determining when your gun is on you and when it’s no longer there. It is simply a Bluetooth device that has no idea where it is in space. It only knows where it is relative to your mobile device. Gun Leash promptly notifies you at the earliest point so that you can retrieve your gun before someone else does.