hardware

A cheap bluetooth button

A small white circuit board on graph paper with a push button in the middle, a zigzag antenna trace in one corner and a few surface-mount partsA closed white 3D printed square case with a small square button on top, a red glow showing at its edge, on graph paper
The underside of the open white case: a coin cell holder over a white board printed KURAHARU#2 and bynirav.com, with a red glow at the edgeA Fusion 360 view of a translucent rounded square case with the circuit board and parts outlined inside it