Honeywell TS13C Temperature Sensor with LCD, White Indoor/outdoor temperature Outdoor temperature range: lithium batteries:-38-degree farenheit to 158-degree farenheit (-38.8-degree celsius to 70-degree celsius) Three user- selectable transmission channels; alkaline batteries:-4-degree farenheit to 158-degree farenheit (-20-degree celsius to 70-degree celsius) Remote transmission range of up to 100-feet (30-meters) LCD displays temperature