1)Indoor temperature and humidity display 2Maximum/minimum temperature and humidity memory function 12/24 hour clock 3The whole point timekeeping function daily alarm function 4Calendar display 5Temperature measurement range: -50;-+70; (-58¡§H-158¡§H) 6Humidity measuring range:10%-99%RH 7Dimensions:106*98*22mm 8Battery:1.5V(AAA)*1 This indoor digital hygro-thermometer measure temperature and relative humidity. It also has a comfort level Indicator. Measure in Celsius from -50 degree to 70 degree or in Fahrenheit from -58 degree to 158 degree F. Sampling period: 10 seconds. Requires one AAA battery (included).. Indoor relative humidity and comfort level Indicator. Clock display with alarm function. Packing:100 sets/box,50 sets/carton