Indoor or outdoor temperature, indoor humidity display. Celsius or Fahrenheit temperature switch display, comfort display. Indoor and outdoor maximum and minimum temperature memory function. Memorized MAX or MIN indoor temperature and humidity value automatically. With back stand and magnetic stick at back side, convenient to place. With a wired external sensor that can be strung to the outside of your house to sense external temperature as as a built-in sensor to simultaneously measure the indoor temperature. Indoor temperature: -10 Celsiusand50 Celsius (and14 Fahrenheit and122 Fahrenheit) Outdoor temperature: -50 Celsiusand70 Celsius (-58 Fahrenheit and194 Fahrenheit) Indoor Humidity: 20 percent RH90 percent RH Use battery: 1.5V (AG13) x 1(Not included) Sensor cable length: . 90cm or 35.4in Product size: 70 x 81 x 20mm or 2.8 x 3.2 x 0.8in Product weight: 66g or 2.32oz Package List:1 x Digital LCD Thermometer Hygrometer 1 x Manual(English)Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.