1. Intelligent temperature and humidity sensor: Equipped with precise measurement technology that captures temperature and humidity values once per second. The 2.9inch LCD display clearly shows five key pieces of information: temperature, humidity, brightness, time, and date, making it ideal for monitoring your indoor climate. 2. Versatile alarm mode: Set individual upper and lower limits for temperature and humidity. If the set values are exceeded, you will be notified, making this sensor for children's rooms, greenhouses, or wine cellars. 3. Flexible power supply: USBpowered with a builtin 500 mAh battery, ensuring up to 4 hours of operation during a power outage. After just 2 hours of charging, the device is ready for use again, providing reliable 24/7 monitoring. 4. Switchable temperature units: Supports both Celsius and Fahrenheit, allowing easy switching as needed. This feature ensures the device adapts to your preferences.