Specification: Usage: Temperature Sensor DHT11 Humidity Module Temperature and Humidity Module DHT11 Sensor Product description: 1. Can detect the humidity and temperature of the surrounding environment 2. Sensor using DHT11 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 3.3V-5V 6. Output form digital output 7. With fixed bolt holes, easy to install 8. Power indicator (red) Product size: 32*14*5mm/1.26*0.55*0.19in Module interface description (3-wire system) VCC: external 3.3V-5V GND: external GND DO: small board switch digital output interface connected to the microcontroller IO port Packing: 1pc Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.