Meade Instruments TS34C-M Long Range Temperature TE923W-M, White Indoor/outdoor temperature and humidity Indoor temperature range: 23-Degree Fahrenheit to 122-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 20-percent to 95-percent 5 User-selectable transmission channels, transmission range of up to 328-feet ; 100-meters Indoor/outdoor temperature and humidity Indoor temperature range: 23-Degree fahrenheit to 122-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 20-percent to 95-percent 5 User-selectable transmission channels, transmission range of up to 328-feet ;100-meters