What is the magnet for? Jon Dennis Cruz April 13, 2023 19:13 Updated The magnet and the sensor work together to monitor entry. If you are monitoring motion only, you do NOT need the magnet. Related articles How do I mount my sensor for monitoring entry? I’m getting false alarms. How can I get rid of them? How to reset Motion+Entry sensor (with video) How do I mount my sensor for motion only? (with video) When would I use the Kangaroo button? Comments 0 comments Please sign in to leave a comment.