A magnetic contact is a door and window sensor

Surface mounted magnetic contacts have surface mounting house, with the reed sensor and magnet mounted parallel to each other.

Alloy-zinc surface mount magnet contact
1 1/2 (40±10) inch(mm) active gap

Alloy-zinc surface mount magnet contact
2 (50±10) inch(mm) active gap

Alloy-zinc surface mount magnet contact
1 (25±5) inch(mm) active gap

Mini stick-on contact with flange
3/4 (20±5) inch(mm) active gap

Mini stick-on contact with flange
3/4 (18±5) inch(mm) active gap

Concealed screw mount with attractive cover
1 (25±5) inch(mm) active gap

Self-adhesive and screw mount
3/4 (20±5) inch(mm) active gap

Screw mount
3/4 (20±5) inch(mm) active gap

Screw mount
3/4 (20±5) inch(mm) active gap

Self-adhesive and screw mount concealed terminals
3/4 (20±5) inch(mm) active gap

27mm stick-on contact with flange
3/4 (20±5) inch(mm) active gap

27mm stick-on contact with flange
3/4 (20±5) inch(mm) active gap