This smart outdoor thermometer and hygrometer has high precision and high-frequency sampling, making it suitable for accurately capturing subtle changes in climate during outdoor activities, providing early warnings, and helping to reduce the risk of not being aware of weather changes in time. ±0.3℃/±3% High Precision Reading: With a built-in SHT-40 sensor, the reading error is only ±0.3℃/±3%. Suitable for outdoor hiking to accurately capture subtle changes in climate, such as mountains, canyons, and other complex terrain, to help reduce the risk of not being aware of weather changes in a timely manner. 2s High-Frequency Sampling: Automatically samples and reports temperature and humidity every 2 seconds, continuously detecting changes in the outdoor environmental space. Compact, Portable & IP65 Waterproof: Compact with a size of 6.3 × 3.5 × 2.3cm. It is equipped with a high-quality hanging rope that is firm and safe. Without worrying about it being exposed to the rain, you can carry it outdoors. Supports App Alerts & Customizable Threshold Range: Through a Bluetooth connection, it can directly detect real-time temperature and humidity via Govee Home app. You can also set a temperature and humidity threshold range. If the threshold is exceeded, an alarm will sound. Data Recording: The app supports 20-day curve reading and 2 years of free data storage and export, allowing you to gain a deeper understanding of seasonal changes and make preventive equipment adjustments to enhance your camping/hiking experience. Durable and Reliable: This portable thermometer features a robust nylon lanyard with an adjustable buckle, which can attach to your backpack, stroller, pet carrier, golf bag, or carabiner clip. The battery can last up to a year, avoiding frequent replacement.