This is a complete kit of accessories and parts to set up your Raspberry Pi 4. All you need is to buy a Raspberry Pi 4 board and that's it. including set. They are well made and easy to assemble. There are no instructions other than a few illustrations on a piece of paper. I found out myself. However, it does not show where to connect the fan pins. The Revain product page shows how to connect the fan. There are Full Speed and Quiet modes for you to try and decide. I connect the wires for quiet cooling. Yes, it's really quiet. So far I haven't seen it overheat and restart.
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