Review on Enhance Your Raspberry Pi 4B Performance: Cooling Fan, RGB Hat, and OLED Display Combo! by Heather Brown

This is great value for money but as others have said the code is not the best. A few quick notes that will hopefully save you some time. The example python code on the manufacturer's website is out of date and Python 2. The library they are trying to use for old I2C is out of date and doesn't work. BUT the display works out of the box using Adafruit's 'adafruit-circuitpython-ssd1306' library for their 128x32 OLED hat. It even has the same i2c address, so the sample code works without modification. The fan and RGB code provided works very well as it simply writes values to the MCU registers on this board. I just set my fan to 100% because it's virtually silent. There are three (3) addressable RGB LEDs on the underside of the board. They can be controlled individually by writing to MCU registers on the i2c bus. Your example code can be used along with the PDF on the I2C communication website.