Conditioning unit: 1. Function: humidity and temperature sensor. Note: humidity measurement 0...100% RH, 2%. Note: integrated AM2302 sensor. Marking on the case: DHT22 click ™ board. RoHS: yes. Spec info: expansion card, microBUS connection. Assembly/installation: PCB through-hole mounting. Operating temperature: -40...+80°C. VCC: 3.3...5.5V