Here is some infos about an OMG compatible the KERUI D025 door/window sensor. This sensor send only one signal when opening (no close signal)
The sensor is powered by one 12V battery.
Sleep current 10uA continuously (measurement around my multimeter accuracy)
When triggered measurement is of 17mA during 3s
12V 23A battery capacity is 55mAh
Sleep current per day ->0.01mA * 24 =0,24mAh per day for sleep
Total per day for sleep: 0,24mAh
4 sending per day ; 3s * 4* 17/3600 = 0,057mAh per day for sending
55/0,297=185 days -> less than a year
I do not recommend this sensor due to its power consumption and the fact that it doesn’t send a close signal.
signal when opening