Check the listing for details. Indoor/Outdoor Digital Thermometer Hygrometer LCD Display Celsius Home/Office. Condition: New – Open box. Listed at 13.95 USD. https://viot.us/HVAC DT3 Indoor/outdoor Dual Temperature, indoor Hygrometer: Display in Celsius. USEFUL FOR: Hygrometer for indoor comfort level; 2 area temperature display, either indoor/outdoor, or air/water, or air/freezer temperatures. 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.(another model with F temperature display) 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) Humidity: 20% to 99% Resolution: 0.1; Power Supply: 1.5 VDC (one AAA alkaline battery, included); Physical Size: 115×64×19mm; Display Size: 63×43mm. EMAIL ALL QUESTIONS TO JOHNBuy it now for only $13.95, fast free shipping from the USA to any where in the USA or Canada, please check out the other listings in my ebay store; more information available at https://www.viot.us/HVAC