Magnetic Switches???

[jmcurless]

Was wondering if Radio Shack is the only place to buy extra ones to add on to a dual window configuration.  I went there I wanted them to match the ones that came with the package and also didn't know if i need a close or open switch.  I would think closed???  Thanks,  Jeremy

[Brian H]

Closed when the magnet is next to the switch.
I believe switches are rated in their non activated state. So the switch is normally open and when activated by the magnet is closed.