Features indoor/ outdoor temperature display, indoor humidity display Celsius or Fahrenheit temperature display 12 h and 24 h time display clock & date display function (the display switches automatically between clock & date every 5 seconds) hourly and daily alarm functions if you use the outdoor temperature sensor, (the display switches automatically between indoor & outdoor every 5 seconds Specifications power: 1 x 1.5V (LR44/AG13) (incl.) temperature range: indoor: -10 °C to +50 °C (+14 °F to +122 °F) outdoor: -50 °C to +70 °C (-58 °F to +158 °F) humidity range (indoor): 20% - 90% RH dimensions: device: 5.8 x 9 x 1.5 cm display: 4.6 x 6 cm cable length: ± 110 cm

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