... RH;3.Display Date,Time and time alarm;4.Max/Min indoor temperature and humidity memory;5.Back light ;6 ... keys:ADD,CODE,C/F,MAX/MIN,SUB/CLR,ALARM,CLOCK,LIGHT;3.Use three LR6 AM3 AA/1.5V ... signal to the Main Unit;2.Measure the Outdoor temperature; Measure Range:-20C—70C or -4F—148F Accuracy:+/- ... 1C or +/-2F;3.Max/Min ondoor temperature memory;4.Celsius and Fahrenheit switch;5.Proof water; ...