La Crosse Technology WIRELESS WEATHER STATION Instruction Manual page 27

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By pressing the CH key, display outdoor sensor data (up to three outdoor
transmitters). The channel number 1, 2 or 3 will be shown.
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A signal reception symbol will be shown indicating that receiver is receving
outdoor temperature.
DCF-77 RADIO CONTROLLED TIME:
The time base for the radio controlled time is a Cesium Atomic Clock operated by
the Physikalisch Technische Bundesanstalt Braunschweig which has a time
deviation of less than one second in one million years. The time is coded and
transmitted from Mainflingen near Frankfurt via frequency signal DCF-77 (77.5
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