Deluxe Weather Forecaster. Indoor and outdoor temperatures in F and C scales * * Indoor and outdoorColor is white/silver for base unit and remote sensor is whiteIndoor and outdoor humidity range 20%-95%Wireless remote sensor transmits up 200' and includes temperature & humidity readings on outside LCD.Holds up to 3 channels, additional remotes sold separately (model #1739)Indoor temp range: 32 degrees F to 122 degrees F/0 degrees C to 50 degrees C.Outdoor temp range: alkaline batteries: -4 degrees F to 140 degrees F/-20 degrees C to 60 degrees CLithium batteries: -40 degrees F to 140 degrees F/-40 degrees C to 60 degrees CBase station requires 2 AA batteries and remote sensor requires 2 AA batteries (not included)Includes temperature and humidity min/max recall, temperature memory, humidity memory, indoor temperature in degrees F and degrees C scales, programmable temperature alerts, temperature and humidity trend indicators, comfort index, barometric pressur