<https://www.bapihvac.com/product/reed-switches-for-the-door-monitor-alarm-dma/#product>
<http://schema.org/description>
"BAPI offers two Reed Switches for the Door Monitor Alarm (DMA).  The \"BA/DMA-RSW1\" is a Press Fit Magnetic Contact, 3/4” (19mm) diameter. The \"BA/DMA-RSW2\" is a Mechanical Surface Mount Switch, 2.5” (64mm) length."
<https://www.bapihvac.com/product/reed-switches-for-the-door-monitor-alarm-dma/>