Sonoff SNZB-04 Instructions D'opération page 12

SONOFF TECHNOLOGIES CO., LTD.
Installation methods
1. Tear off the protective film of the 3M adhesive.
2. Try to align the mark line on the magnet with that on the transmitter
during installation.
3. Install them in the opening and closing area separately.
Make sure the installation gap is less than 10mm when the door or the
window is closed.
The device weight is less than 1 kg.
The installation height of less than 2 m is recommended.
<10mm
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