These are the I2C compatible temperature & humidity sensor in a nice enclosed style. This sensor contains a DS18B20 temperature sensor and a capacitive humidity sensor. The microcontroller inside does the readings and provides a simple I2C interface for reading the formatted calibrated output data. This sensor comes in a rugged case with mounting bracket useful for tough conditions.whereas it is not rated as 'weatherproof', this sensor would do much better for sensing where there might be wind, rain and heat.
Simply connect the red wire to 5V power, black to ground, yellow wire to your i2c data pin, and the white wire to the i2c clock pin. You cannot change the i2c address so only one sensor per i2c bus. Two ~10Kohm pullup resistors are required for use, connect from the SDA and SCL lines to the power wire, the pullup resistors are not included!