This is the Tag Manager sat on my Wifi Router:
Untitled by brf, on Flickr
A tag blue-tacked to a door:
Untitled by brf, on Flickr
If you open the door you get:
Untitled by brf, on Flickr
However, you only hear the voice say ‘Hallway door has moved’ if the App is running in the foreground – so pretty useless 99.99% of the time. It does have email / twitter notifications, so you’d need to use those to alert you if the phone was in your pocket.
Also, they don’t seem that reliable eg OH just when in and out of the hall and I only got a notification for her coming back in….