Features 1 WIRELESS SENSOR: With a maximum range of 328 feet/100 meters (wireless frequency 433MHz), you can confidently monitor your entire home. ACCURATE READINGS: This wireless indoor outdoor thermometer features a large LCD display that measures real time temperature and humidity, displaying maximum minimum records and trend arrows over the past 24 hours. MONITOR YOUR HOME WITH CONFIDENCE: Keep track of the temperature and humidity levels in your entire home, basement, or greenhouse with this reliable electronic indoor outdoor thermometer. VERSATILE DISPLAY: The monitor comes with a magnetic back and a stand, allowing you to place it on your desktop or attach it to your refrigerator as a decorative piece. WIDE MEASUREMENT RANGE: The indoor temperature range is from 14℉ to 122℉ (‑10℃ to 50℃), and the outdoor temperature range is from ‑40 ℉ to 158 ℉ (‑40 ℃ to 70℃ ), with an accuracy of ±1 ℃. The indoor outdoor humidity range is from 20% to 95%. Specification: Item Type: Wireless Digital Hygrometer Thermometer Material: ABS Battery Type: AAA battery x 4 (2 for sensors, 2 for monitors)(Shipped without batteries) Indoor Temperature Range: 14℉ to 122℉ (-10 ℃ to 50 ℃) Outdoor Temperature Range: -40℉ to 158℉ (-40℃ to 70 ℃) Temperature Resolution: 0.1℃/℉ Humidity Range: 20% to 95% Humidity Resolution: 1% Wireless Range: 328ft/ 100m depending on vacant space Wireless Frequency: 433MHz Backlit: Automatic off in 10 seconds Package List: 1 x Sensor  1 x Display  1 x Manual  Package List 1 x Sensor 1 x Display 1 x Manual