Reed switches sensitivity can rely on how the magnetic field interacts with the ferromagnetic structures in the switch. The field must be channeled strongly enough between the two reeds to cause them to flex. In some cases, there is a possibility that there can be zones where a reed switch is not sensitive to the presence of the magnet, but can be activated after rotating the magnet 90°.

These devices do often support a wide selection of arrangements, but can have multiple trip points depending on the magnet motion and are more difficult to place and install due to the device size.