ITEAD Customer Care Center

 I'm wondering if there's a door or window sensor that would allow me to tell if a window or door is open /closed

I'd like you use the sonoff  to turn on a heating source if a room is colder then a certain temperature  but only if the window is closed

A product exists but currently only shows that a door/window has been opened.

https://www.itead.cc/sonoff-rf-bridge-433.html

It would be good if the sensor also reported when the door/window is closed. This is very useful for a few uses like the above or in conjunction with the inching unit to know remotely if eg. a garage door has been left open .

Thanks