Meade Instruments TS33C-M Temperature and Humidity Sensor with LCD, White 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 Indoor/Outdoor Humidity range 25-percent to 90-percent; alkaline batteries:-4-Degree fahrenheit to 158-Degree fahrenheit ;-20-Degree celsius to 70-Degree celsius 3 User-selectable transmission channels, transmission range of up to 100-feet;30-meters LCD displays temperature and humidity