You need a sensor small enough to hide where a thief won't find it. These encapsulated reed and magnet switches come with leads, moulded plastic housing, and a footprint tiny enough to slip behind a door frame or into a car panel. Contacts close when the pair sits together; open when separated. Normally Closed per pair. Your alarm stays armed. The sensor stays invisible. Wire it in, test, done
| brand | Jaycar |
| sku | LA5074 |
| category | Electronics & Components |
| subcategory | Electronic Components |
| contact_type | Normally Closed (N.C.) per pair |
| housing | Encapsulated, moulded plastic |
| leads | Included |
| operation | Contacts closed when units together; open when apart |
| application | Home security and car alarm installation |
| rrp_aud | 15.36 |
| country | Australia |