Good characteristic of abrasion-proof.
Best Choice for you to protect family.
There are two types of reed switches: "normally open" reed switches and "normally closed" reed switches. The metal reeds on a normally open switch stay open when there is no magnet near the switch. In the presence of a magnetic field, the contacts of a normally-open reed switch will close. A normally-closed reed switch is closed when it is not near a magnet; as a magnet is brought close to it, a normally-closed switch will open.
Dimensions: 10 x 18.5mm
Switch pattern: N/O normally closed
Contact capacity: Maximum switch current: 0.5Amp
Voltage: 100 VDC
Rated power: 10W
Actuation distance: 15-25mm
Wire lead: 24 Awg, About 260mm long
Mounting method: Embedded
Recommendations in application: wooden door, window