Three layers stack into the finished unit: the shell that
you touch, the board that does the work, and the battery that powers it.
Pull them apart to see how they assemble; switch on X-ray to see the board
through the shell.
Method: reveal the hidden · Not to scale
assembled
FIG. 1Drag the slider to explode the stack, tap a layer to isolate it, and
toggle X-ray to see the board through the shell — labels travel with their part as it moves.