Cheat device for Playstation2 games, allows you to get infinite lives etc in supported games(most games support cheats I think).
Set contains 1x CD, and 1x 'dongle' (plugs into memory card socket)

I think your PS2 will need to be able to read CDRs(backup CDs) to be able to use this.
If your PS2 has a modchip, USB modchop('neokey'), slide tool or similar modification, it should work fine.
I haven't been able to test this, as my PS2 has a very weak laser & can't read the disk. However it looks like it's basically the same as an 'Action Replay 2' set.
Because of this, I can't provide a guarantee/support for these, but if it's like ones I've used previously, it should be simple to use.