Memory of MAX & MIN measuring value; 12-hour / 24-hour displaying system selectable; ºC / º F unit selectable; Alarm function; Clock & Calendar function (month and date ); Desk-top placing or Wall Hanging; Temperature range: -50~ + 70 ºC ( -58 ~ +158 º F ); Humidity range: 20%~99%RH; Temperature :± 1 ºC ( 1.8 º F ); Humidity :± 10RH ( 40% ~ 80% ); Power supply: 1.5V ( AAA size ) X 1; Product dimension: 100 x 100 x 15mm; Weight : appros.125g; Storage condition: -20 ºC ~60 ºC , 20~80%RH;