... 5%RH;3.Display Date,Time and time alarm;4.Max/Min indoor temperature and humidity memory;5.Back light ;6 ... ;2.Eight keys:ADD,CODE,C/F,MAX/MIN,SUB/CLR,ALARM,CLOCK,LIGHT;3.Use three LR6 AM3 AA/1.5V ... 20C—70C or -4F—148F Accuracy:+/-1C or +/-2F;3.Max/Min ondoor temperature memory;4.Celsius and Fahrenheit switch;5 ... size:25*12mm;2.Three keys:CODE,C/F,MAX/MIN;3.Use two LR03 AM4 AAA/1.5V alkaline batteries.PACK ...