It presses/clips over the processor, disabling it, replacing it with an emulated, accelerated 68000 via a Raspberry Pi.
The Raspberry Pi is NOT included in this listing, but a Pi Zero 2W (shown) or Pi 3A+ are the recommended versions that fit.

Acceleration and CPU upgrade (up to 68040) is not all it does though.

Using EMU68, it also emulates SCSI drives/partitions on the inserted SD Card, Picasso GFX card over HDMI, over 300MB of Fast Ram, Kick switching, DF0/DF1 boot swapping etc.

These partitions can also be loaded in the WINUAE emulator to make installing and transferring of software must easier/faster than the old floppy disks.

Each pistorm comes flashed with the standard firmware suitable for EMU68, but it's not hard to change this using the Pi itself and a clean 32 bit OS install.

More info:

Original github page: https://github.com/LemaruX/PiStorm600

EMU68 info & Setup: https://michalsc.github.io/Emu68/

EMU68 setup tutorial 1: https://www.retro32.com/amiga-resources/080220223836-amiga-pistorm-emu68-setup-guide-tutorial

Review of sorts: https://linuxjedi.co.uk/2021/12/27/800mips-amiga-with-emu68-and-pistorm/

My recommendation is to seek out Caffeine OS, a preconfigured image you write to a 32Gb SD card or larger. 

I am also selling a 1MB chip RAM upgrade with RTC (real time clock) in another listing.

UK buyers post free.