A reed switch is a sealed glass tube, with two contacts inside it. It is a magnetic switch, either open or closed. When a magnetic field is applied to the component, the two contacts attract, and close the switch. When the field is removed, the natural spring in the contacts forces them apart again.
Typical dimensions are 10- 15mm in length and around 2.2mm diameter, not including the connecting legs
If a magnetic field strong enough to operate them cannot be guaranteed, they cannot work
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