1. can detect surrounding environment of the humidity and temperature 2. DHT11 sensor adopts 3. humidity measurement range: 20% 95% (0 degrees-50 degrees range) humidity measurement error: +-5% 4. temperature measurement range: 0 degrees-50 degrees temperature measurement error: +-2 degrees 5. working voltage 3.3 V-5 V 6. output form digital output 7. has fixed bolt hole and easy installation 8. PCB size: 3.2 cm * 1.4 cm