Features: Using an accurate and sensitive temperature and humidity sensor, it can achieve a temperature error of 0.5(1), a humidity error of 5%, and refresh once per second for higher accuracy. We uses a high-end BT 5.0 chip and can easily monitor temperature and humidity data remotely on app via BT. Support temperature data export function, record a group of data every 10 minutes. Alert notification will be sent to your phone once temperature or humidity is out of preset range. Intelligent function enables you to adjust situation of your wine cellar, greenhouse or other places in for time. Package Includes: 1x Temperature Humidity Sensor Specifications: Material: ABS Size: approx 35x35x15mm/1.4x1.4x0.6in Temperature range:-20-65() Humidity range: 0-100(RH) note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.