Features: Large LCD character display Temperature display for 2 areas Built-in sensor for indoor air temperature External outdoor or water/refrigerator/freezer temperature sensor with 10-feet insulated wire. Temperature display in °C. Desk top free standing or wall mountable Technical Parameters: Temperature range: Indoor: -30 to 50 °C Outdoor: -50 to 70 ° External NTC thermistor on 10 ft wire; Accuracy: +/- 1C (between -20, 80 °C), or +/- 2 ° (out side of -20, 80 °C) Resolution: 0.1; Power Supply: 1.5 VDC (one AAA alkaline battery, included); Physical Size: 115×64×19mm; Display Size: 63×43mm.