The Meade TS33F-M temperature and humidity sensor with probe, indoor/outdoor temperature and humidity, user-selectable Degree celsius or Degree fahrenheit , outdoor temperature range: lithium batteries:-38-Degree fahrenheit to 158-Degree fahrenheit ;-38.8-Degree celsius to 70-Degree celsius , alkaline batteries:-4-Degree fahrenheit to 158-Degree fahrenheit ;-20-Degree celsius to 70-Degree celsius , indoor/outdoor humidity range 25-percent to 90-percent, 3 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, white.