Product size :110*100*20mm Power Supply No. 7 battery *2 Temperature display range :-20C to 70C Humidity range: 10% to 99% Temperature resolution :0.1C Humidity resolution :1%RH Temperature measurement accuracy: Earth 1C Humidity measurement accuracy: Earth 5RH% 1. 4 Backlight Large LCD Screen4" large screen offer much clearer display even at a distance. Making it easier to read in dim light conditions and simple operation. 2. Rapid Sensing &High AccuracyTemperature and humidity gauge updates record every 10 seconds, with high sensitivity and responsive reading to provide updated and accurate readings. Measuring range of temperature is from-4~158(-20~70), temperature accuracy range around+/-1.0. 3. 24hours High &Low RecordsHygrometer digital thermometer track condition throughout the day with the high and low records to ensure a healthy home. Reliable operating buttons on the front for manual setting / switching. 4. Stand or Hang Easy to PlacePortable Size small and compact design with table stand and wall-mountable hole, this digital thermometer indoor can be easily attached to your wall or placed on a table. Suitable for babys room, nursery, office, closet, incubator, greenhouse, garden, wine cellar, basement critter terrarium, etc. 5. Healthier HomeDigital Thermometer& Hygrometer easy to read the comfort of your surroundings with the changes in emoticons Dry/Comfort/Wet, Thermometer hygrometer with temperature and humidity monitor ensures proper indoor humidity control which is important to skin allergen and health benefits.