Review on Xiaomi Mi Smart Home Door/Window Sensor 2 (MCCGQ02HL) CN by Kiril Velchev ᠌

I'll tell you about the non-standard use of the device. I embedded it in the door lock so that I could remotely see if I closed the door. To do this, I soldered the Hall sensor, took it out of the case and placed it inside the door jamb. I replaced the native magnet with a thin neodymium one, attached it to a flat bolt of the lock. The distance to the magnet sufficient to trigger the sensor is 8-10 mm. For soldering, it is better to take thin soft wires. I used MGTF 0.03. Cheap CR2032 sat down in a week, GP has been working for a month. The device works great.