xin-sheng 3 Sets of MC-38B NC & NO Embedded Magnetic Gap Switch for Door and Window Sensor for Home Security

Gikfun MC-38 Wired Door Sensor Magnetic Switch for Arduino EK1656

Aleph DC-1561 W Surface Mount Alarm Magnetic Contact Package of 10

Sonoff SV Safe Voltage Wifi Wireless Switch Smart Home Module DC 5-24V Phone APP Control Support Secondary Development for Amazon Alexa Google Nest Geekstory

HiLetgo 2pcs 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger

5X Normally Closed Normally Open Magnetic Switch Proximity Switch for DC 5V 12V 24V Light, GPS,Alarm or Other Device

BNYZWOT MC-38 Surface Mount Wired NC Door Sensor Alarm Magnetic Reed Switch White 10 Pair

2xNC NO Combined Magnetic Switch Door Sensor Door Contact Dry Contact Open, Circuit On

SM-226L-3Q Seco-Larm Overhead Door Mount N.C. Magnetic Contact w/ 3 Wires for N.O./N.C. Applications

ESP8266 NodeMcu ESP8266 Module (4pcs),ESP-12E NodeMcu LUA CP2102 Internet WiFi Development Board Works with Arduino IDE/Micropython

IZOKEE D1 Mini NodeMcu Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino, 100% Compatible with WeMos D1 Mini (Pack of 3)