Pretty neat! I like the idea of an electronic device for tabletop dice rolling that isn't a smartphone, something with more 'tactile feedback' so to speak- more built-for-purpose and less of a distraction. Obviously you can just roll dice, but having the system-specific math automatically calculated based on the rolls can save so much time and keep the game moving. That's partly why we've largely moved to VTTs (Foundry is excellent)
I'm not sure about the wristwatch form factor though, most dice rolls in TTRPGs are visible to everybody as they're made, so I would've expected a device you can place in the center of the table so everyone can see the rolls (the exception being private DM rolls of course). Being system agnostic or programmable would also be really cool, but I can understand why a hobby project would just focus on the game the creators (and 99% of the TTRPG market) are playing.
Maybe this is what you are looking for? https://github.com/GhostWrench/ttrpg9000. Full disclosure: this is my design and I do sell it on Etsy (Unfortunately I am currently out of stock and won't be back in until I make some BOM simplifications for production). But if you want to make your own, you can get the parts for ~$80 USD for small runs, assuming you can solder 0805 SMD parts.
I'm not sure about the wristwatch form factor though, most dice rolls in TTRPGs are visible to everybody as they're made, so I would've expected a device you can place in the center of the table so everyone can see the rolls (the exception being private DM rolls of course). Being system agnostic or programmable would also be really cool, but I can understand why a hobby project would just focus on the game the creators (and 99% of the TTRPG market) are playing.