These magnetic door switch sensors are already seen, if not - then in old movies for sure where they were used as anti-theft devices, ie. alarm systems. In fact, it is a magnet and the reed switch inside a pair. When they are close to each other (recommended 13mm or less), reed switch closes. Connect it to Croduino / Arduino as an ordinary switch use the detection of open doors, windows, drawers, cupboards etc. • Voltage: max. 200V, best used 5V Croduino/Arduino • Max reed power: 100mA • Max detection distance: 15mm, 13mm recommended • Dimensions: 29 x 14 x 9mm • Cable length: 30cm * Voltage: max. 200V, best used 5V Croduino/Arduino * Max reed power: 100mA * Max detection distance: 15mm, 13mm recommended * Cable length: 30cm * Dimensions: 29 x 14 x 9 mm / 1.1" x 0.6" x 0.4" https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-02-16 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-11 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-12 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-13 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-15 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-18 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-03-21 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-02 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-03 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-12 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-14 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-20 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-23 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-24 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-04-28 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-05-10 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-05-12 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-05-16 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-05-27 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-05-29 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-03 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-05 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-08 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-10 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-19 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-06-22 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-07-01 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-07-03 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-07-31 https://elecena.pl/product/25316725/magnetic-door-window-switches 2024-08-01 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-01-28 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-01-29 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-02-26 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-02-27 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-04-30 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-05-01 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-06-08 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-06-10 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-06-27 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-06-28 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-07-11 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-07-12 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-08-08 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-08-09 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-08-18 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-08-19 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-02 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-03 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-05 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-06 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-21 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-10-22 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-12-02 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-12-03 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-12-17 https://elecena.pl/product/25316725/magnetic-door-window-switches 2025-12-24