Reset sensors from ADT system

How to reset door sensors

To better assist you, what is the model number of sensor you are referencing? If you do not know, you can submit a photo to us.

A variety of installation and programming guides can be found here:

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That looks like a Qolsys 319.5Mhz Sensor. The sensor itself does not need to be reset in order to be learned into a new panel or reenrolled into a panel if it was deleted at one point.

Here is a programming guide for Qolsys with 319.5 sensors.