I think I found where the co-founder got the board. Not exactly the same, but very close: From Alibaba: https://www.alibaba.com/product-detail/Original-ODM-OEM

I think I found where the co-founder got the board. Not exactly the same, but very close: From Alibaba: https://www.alibaba.com/product-detail/Original-ODM-OEM-TI-CC2640-ble_60380879039.html https://www.alibaba.com/product-detail/Original-ODM-OEM-TI-C... As a bonus, it appears to already have a physical button :) The picture from the author's article: https://1.bp.blogspot.com/-wJjSUagWqGQ/YTAPCPEPDII/AAAAAAAAN1o/_gU_lTlwkd0HAff6l05X2rbiNkKVcy1cgCLcBGAsYHQ/s2048/20210902_082235.jpg https://1.bp.blogspot.com/-wJjSUagWqGQ/YTAPCPEPDII/AAAAAAAAN...