The Waveshare DHT11 Temperature-Humidity Sensor with Sensor Modules 29.21x18.03mm RoHS is an electronic part that helps measure and monitor the temperature and humidity levels in a variety of environments. The sensor has an accuracy of ±2? for temperature and ±5% for humidity, and uses I2C interface to communicate with the host. It consists of an integrated high-accuracy temperature and humidity sensor, signal processing chip, and specialized capacitive humidity sensing element that works with the temperature. It also has an ultra-small size (29.21x18.03mm) and RoHS certification, making it a reliable and quality part. The sensor can be used in a wide range of applications such as home automation, HVAC systems, environmental monitoring, and other scientific fields.