Honeywell 7940 Frequently Asked Questions

What Do Normally Closed and Normally Open Mean?
"Normal" is the normal state of an opening, such as a door. Normally open/closed refers to the state of a contact connected to a door in its normal position.

How Do I Install Recessed Door Or Window Alarm Sensors?
Recessed door and window alarm sensors are great for applications where a homeowner doesn't want the item to be seen. See how easy it is to install them!

What are recessed door sensors?
Click here to learn what a recessed door sensor or recessed door contact is.