Feature: 1. GY-SHT31-D Temperature/Humidity sensors are some of the finest and highest-accuracy devices you can get and it has an excellent ±2% relative humidity and ±0.3°C accuracy for most uses. 2. Have a true I2C interface for easy reading, and even with two address options. It also is 3V or 5V compliant, so you can power and communicate with it using just about any microcontroller or microcomputer. 3. The chip can use 2.5-5VDC for power. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro , use 5V. For a 3.3V controller, connect to 3.3V GND - common ground for power and logic. 4. I2C clock pin, connect to your microcontrollers I2C clock line. This pin has a 10K pullup resistor to vin. 5. This is the I2C address selection pin. This pin has a 10K pull down resistor to make the default I2C address 0x44. You can tie this pin to vin to make the address 0x45. 6. Hardware reset pint. Has a 10K pullup on it to make the chip active by default. Connect to ground to do a hardware reset. 7. Alert/Interrupt output. You can set up the sensor to alert you when an event has occured. Check the datasheet for how you can set up the alerts. Specification: Conditon: 100% Brand New Item Type: GY-SHT31-D Temperature Humidity Sensor Material: Aluminium Color: As Pictures ShownInterface: I2C Power Supply Voltage: 2.4V- 5.5V RH Working Range: 0-99.99%RH Operating Temperature Range: -40°- 125°C (-40°- 257°F) RH Response Time: 8s (tau63%). Package List: 1 x GY-SHT31-D Temperature Humidity Sensor