I have been working on a printed circuit board for this project for it to fit on the wrist. It's going to be about 1.3 x 1.5 inches or so. I'm also making a slit for a wrist strap . I will just use the bare-bones PCB that I'll get from @oshpark just to see what it would feel like. Later down the line, I'm going to think about an appropriate packaging.