Xiaomi Aqara Manual De Instrucciones página 7

③ Stick to doors or windows (It is recommended to install
the sensor unit on the unmovable surface, the magnet
on the movable surface, and make sure the installation
gap is less than 22 mm when doors or windows are
closed).
* Keep the surface clean and dry.
Specifications
Model: MCCGQ11LM
Dimensions: 41 × 22 × 11 mm (1.61 × 0.87 × 0.43 in.)
Wireless Protocol: Zigbee
Battery: CR1632
Maximum Detection Distance: 22 mm
Operating Temperature: -10° – +50° C
Operating Humidity: 0 – 95% RH, no condensation
Installation gap less than 22 mm