Shelly Window/Door 2
What is Shelly Window/Door 2?
The lightning fast smart, door and window sensor. Shelly Door/Window is designed to detect and report the opening and closing of doors and windows. Its compact design allows it to be easily installed on any door or window, and because of its lightweight, the sensor is nearly invisible.
network at home.
and has a battery life of up to 2 years.
(Batteries not included - Requires 2 x CR123A)