Indoor / outdoor temperature, indoor humidity display. Celsius / Fahrenheit temperature switch display, comfort display. Indoor and outdoor maximum and minimum temperature memory function. Memorized MAX/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 Celsius+50 Celsius (+14 Fahrenheit +122 Fahrenheit) Outdoor temperature: -50 Celsius+70 Celsius (-58 Fahrenheit +194 Fahrenheit) Indoor Humidity: 20%RH90%RH Use battery: 1.5V (AG13) * 1(Not included) Sensor cable length: . 90cm / 35.4in Product size: 70 * 81 * 20mm / 2.8 * 3.2 * 0.8in Product weight: 66g / 2.32oz Package List:1 * Digital LCD Thermometer Hygrometer 1 * 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.