Features Measurement Accuracy Range: The temperature measurement range of temperature humidity sensor is from ‑20℃ to 60℃, the temperature accuracy is ±1℃, the humidity accuracy is ±5%RH, and the humidity measurement range is from 0% RH to 100 percent RH. APP Alarm: When the indoor temperature and humidity are higher or lower than the normal value, the sensor will send a message to remind you through the APP. Free Data Storage and Export: The room humidity meter uploads data to the App when connected via WiFi. Enjoy a 20 days online data storage view and export up to 2 years worth of data seen through clear historical trends and graphs. Easy Installation: The sensor is applicable to a variety of complex application sites and can meet all your installation environment requirements. 100% Satisfaction: You will enjoy a 24-months-warranty from the day you receive the Wireless Indoor digital thermometer. Please feel free to email us if you have any questions about the Digital Hygrometer Indoor Thermometer. Specification: Item Type: WiFi Thermometer Hygrometer Material: ABS Mode: TH01 Support Wireless Network Protocol: WIFI 2.4GHz Support Wireless Standard: IEEE 802.11b, g, n Power Supply: AAA battery x 2 (shipped without battery) Temperature Measurement Range: - 20℃ to 60℃ Temperature Accuracy: ± 1 ℃ Humidity Measurement Range: 0% RH to 100 Percent RH Humidity Accuracy: ± 5% RH Package List:1 x WiFi Thermometer Hygrometer1 x Manual 1 x Double Sided Adhesive Tape Package List 1 x WiFi Thermometer Hygrometer 1 x Manual 1 x Double Sided Adhesive Tape