Additional magnets can allow you to have two protected positions for a sliding window or door, making it possible to leave the entrance cracked open, as illustrated below. SimpliSafe magnets are made from rare-earth materials, making them extra strong and long lasting, leading to an easier installation.
Example 2-magnet installation
In figure 1, the window is fully-closed and the Entry Sensor is next to the first magnet. In figure 2, the window is 6 inches open and next to the second magnet. The window can be left in either position with the alarm on and if the window opens further from either position, the alarm will be triggered.