Does your Keypad look like the one pictured to the left? Then you're in the right place! You've got the Original SimpliSafe system. If you purchased a new system in 2018 or later, you likely have the Gen 3 SimpliSafe. Click here to view this article for the Gen 3 SimpliSafe system. If you're not certain which system you have, you can tell the difference here.
The Entry Sensor magnet uses a slightly different adhesive than the other sensors. Remove the magnet by rotating the magnet slowly until the adhesive loosens and you can pull it off the wall.