Shelly BLU Door/Window List

Wasn't sure the Bluetooth range would reach through a wall, but it's been rock solid on my back gate for three weeks. The magnet gap is tiny enough that it catches the door even when it's just barely cracked.

Paired it with a Plus plug I already had and it showed up in the app in seconds. The magnet is strong enough that the two halves snap back together cleanly, and I get an alert on my phone the moment the back door opens.

Setting this up took less time than making coffee, and the magnet gap detection is spot-on even with a thick door frame. Battery's been going strong for two months now, which is better than I expected from something this small.