If you have the sensor on the window you can push the button to disable it. You have to open it and leave it open with in ten seconds. That sensor will stay disarmed till it it closed again. Once you close it, it works as normal I use this on the back door on days the weather is nice or to let the dog in and out when the alarm is armed while at home. There is a delay though with it is armed at home and someone opens up something I did see on the nest site that this should be addressed in a future firmware update.