La Crosse Technology WS-9121 - Manual (Page 20)

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* When the signal from the transmitter is successfully received by the
Temperature Station, this icon will be switched on. (If not successful, the
icon will not be shown on the LCD). User can therefore easily see
whether the last reception was successful (“ON” icon) or not (“OFF” icon).
On the other hand, the short blinking of the icon shows that a reception is
being done at that time.
For a better display clarity, the LCD screen is split into 3 sections,
showing the information of time, indoor temperature and outdoor data.