This is DHT22 is a digital temperature and humidity sensor.
It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed).
Compared to the DHT11, this sensor is more accurate and works in a bigger range of temperature/humidity
0.5 Hz sampling rate
2.5mA max current use during conversion (while requesting data)
Dimension: 40 x 23mm
Voltage: 3 – 5V
Port: digital two-way single bus
Temperature range: -40 to 125 °C temperature readings ±0.5°C accuracy
Humidity: 20-90% RH ± 2% RH
Platform: Arduino, SCM