I bought it because DS regularly hides my keys but it goes off at any tiny little sound!
Except, of course, when i do actually loose my keys and have someone waiting for me to open my front door whilst i go around the house whistling for it like a moron until i actually find it because i am looking for it.
Then, as expected, it goes off as i try to unlock the front door, then repeatedly goes off when i am talking to the visitor at the door, when there are absolutely no loud sounds
Grrrr