The door sensor records the number of door openings made, length of opening, cold room and energy loss reduction.

Using a magnet, it detects the opening and closing of a door, window, fridge, furniture, whatever. But there is something magical about it. And it’s not just the very low price point.

Not only does is report the current status (open / close) it also counts:

1. How often it was opened
2. How long it was kept open