The BME280 is an I2C-compatible temperature, humidity, and pressure sensor chip manufactured by R&D Software Solutions. The SS-BME280-I2C is a pre-built module with all the necessary components to quickly add this BME280 chip to your project. The module includes an expansion board, I2C cable, and a 13x27mm BME280 chip. It runs on 3.3/5V DC power, and can be used for sensing temperature, humidity, and barometric pressure.