Honeywell TS33F Temperature and Humidity Sensor with Probe, White Indoor/outdoor temperature and humidity Outdoor temperature range: lithium batteries:-38-degree farenheit to 158-degree farenheit (-38.8-degree celsius to 70-degree celsius) Indoor/Outdoor Humidity range 25-percent to 90-percent; alkaline batteries:-4-degree farenheit to 158-degree farenheit (-20-degree celsius to 70-degree celsius) User-selectable transmission channels, transmission range of up to 100-feet(30-meters) Removable temperature probe with 10-feet (3-meters) cable, LCD displays temperature and humidity