You might have them on your doors and windows as part of a burglar ... In his design, an actuating reed on one end fluctuates between a magnetic reed and a non-magnetic one on the other, and ...

If you click on links we provide, we may receive compensation. People say it installs quickly and holds up for years Clint is a veteran journalist with more than 13 years in digital publishing.

A magnetic reed switch on the wall of the real mailbox pairs with a magnet in the flag. To determine whether the door is open, [Bob] initially used another magnetic reed switch on the underside ...