Wireless App Control - The temperature sensor uploads data to the app when connected via Bluetooth. You can check the maximum and minimum temperature and humidity values in the app from your phone. Smart devices like mobile phones can connect up to 100 temperature sensors simultaneously. High-Accuracy Sensor - A built-in MEMS sensor updates every second for more accurate and faster data. The temperature error can reach ±0.5℃ (±1℉), and the humidity error can reach ±3%. Equipped with a Bluetooth 5.0 chip, the temperature sensor offers real-time wireless monitoring of temperature (-20 - 60°C) and humidity (0 - 100% RH). The connection distance is up to 50 meters (164 feet) (in open area). Smart Alert Reminder - App data turns red to alert you and your family about changes in temperature and humidity and make adjustments over time when data exceeds preset values. An alert is sent to the app. It can be applied to home monitoring, pets, refrigerators, freezers, walk-in coolers, wine cellars, and greenhouses, etc. Data Storage Export - The thermometer - wireless hygrometer records data in the app every 10 minutes for a total of 100 days. Size: 100*60*22mm Package Includes: Thermometer *1, Short Needle *1, Instructions *1