Magnasphere manufactures door position switches/ contacts.
The MAGNASPHERE high security switch was designed to address the undetected breaches of security that could occur while using reed switch based home security system contacts. In the 1970s, once it was discovered how easy it was to defeat a reed switch contact, the US Government demanded a more effective countermeasure to protect its highest classified areas. While these magnetic defeat resistant devices are now commonly used to detect breaches in high security facilities, their high cost and large size made them an impractical security solution for most residential applications. Resistant to external magnetic defeat tampering and virtually unbreakable, MAGNASPHERE's patented switch technology provides the absolute highest level of intrusion detection available to any security system owner today. In fact, MAGNASPHERE provides the same level of external magnetic defeat protection found in the Federal Government's most secure installations, but at a fraction of the cost and size.