Simple Reed Switch (Magnetic Switch) Circuit to Glow a White LED - YouTube
Magnetic Switches | PINTSCH TIEFENBACH USA - Components and system solutions for rail traffic and industrial applications
Autocatch mod using reed switch (no cutting required - activated by a magnet) : r/GoPlus
Magnetic LED Switch - 12V/24V - Input 3.5mm x 1.5mm Use for Stage Cabinet Lights - Under Cabinet Lighting - Kitchen Lighting and All Other LED Lighting use - - Amazon.com
Monitor Your Door Using Magnetic Reed Switch and Arduino | Random Nerd Tutorials