La Crosse Technology WS-9625U-IT - Manual (Page 58)

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To wall mount:
1. Secure the bracket onto a desired wall using the screws and plastic anchors.
2. Clip the remote thermo-hygro sensor onto the bracket.
Note:
Before permanently fixing the sensor wall base, place all units
in the desired locations to check that the outdoor temperature
reading is receivable. In event that the signal is not received,
relocate the sensors or move them slightly as this may help the
signal reception.