Features High Accuracy: The GY-SHT31-D temperature/humidity sensor is some of the best and highest accuracy device you can get, with excellent ±2% relative humidity and ±0.3°C accuracy for most uses. I2C Interface: Has a real I2C interface, easy to read, and even has two address options. The temperature and humidity sensor is also 3V or 5V compatible, so you can power it and communicate with it with just about any microcontroller or microcomputer. 2.5-5VDC Power Supply: The chip can use 2.5-5VDC power supply. To power the board, give it the same power as the logic level of the microcontroller, e.g. for a 5V micro, use 5V. For 3.3V controllers, connect to the 3.3V GND common ground for power and logic. I2C Clock Pin: I2C clock pin, connect to your microcontroller I2C clock line. This pin has a 10K pull-up resistor to vin. Pull Down Resistor: This is the I2C address select pin. This pin has a 10K pull-down resistor, making the default I2C address 0x44. You can connect this pin to vin to make the address 0x45. 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 Package List 1 x GY-SHT31-D Temperature Humidity Sensor