This is an outstanding accessory for my new Pi 4 8GB. This comes with an expansion card and mini fan included, which when assembled is roughly the size of two pi 4 side by side so the overall footprint remains suitably small when used for desk top computing. Assembly was easy, following the instructions included in the box and also with the Pi Huts own link on the web site. The included mini fan is whisper quiet when in use, with a nice blue LED glow and keeps the Pi 4 cool with the included heat sinks. Very pleased with this addition to the Pi case options