What do you buy a producer for his birthday? Help

Hi everyone, my boyfriend is a music producer; he creates beats on his laptop and works part of a team at a studio, collaborating with other producers, running camps, and engineering for clients. I have absolutely 0 idea what to buy him as idk anything about this, but I want to buy him something useful that he'll love. Does anyone have any ideas? Pleaseeee help!! Thank you so much.