ADT Wireless Door Window Sensor Magnet - Zions Security Alarms
Amazon.com: Sensor Riser Compatible with ADT - DIY Contact Sensor Spacer for ADT Wireless Home Security Systems Window Door Motion Sensors Alarm System Home Security Accessories, Sensor Not Included (3/4 Inch) :
Best Buy: ADT Door and Window Sensor for Home Security SSH1R0-29
How to set up your Blue by ADT Door & Window Sensors - YouTube
How Do Door Sensors Work & Do They Alert You of Motion? | Security.org