Function and features: *Display Indoor and outdoor temperature simultaneously *Switch between C/F *Max. /Min. Temperature value memory *Max. /Min. Temperature value recovery function Technical parameters: *Measuring range: Indoor temperature -30 C+50 C(-22F+122F) Outdoor temperature -50 C+70 C(-58F+158F) *Resolution: 0.1 C *Power supply: One 7# Alkaline battery Instruction: *Display current temperature value when install the battery. *Min Key: Press it then display the Min. Memory value *Max key: Press it then display the Max. Memory value *Reset key: Under Min/Max. Modes, press "Reset" then the former memory value returns to the current value. *C/F: Under C mode to display Celsius; Under F mode to display Fahrenheit