> For the complete documentation index, see [llms.txt](https://ask.simplehw.eu/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ask.simplehw.eu/kb/sensors/magnetic-switch.md).

# Reed switch

The reed switch is an electrical switch operated by an applied **magnetic field**. This sensor is very important in **SimpleIndustry and SimpleMeter** devices as it takes over button functionality and is the main sensor the device is operated by (downlink requests, activation/deactivation).