Choose now the Pen Tool (P) and represent an element like the next one:
Blending Options>Gradient Overlay:
Represent inside the made button a small roundness also:
Start representing the power supply button. It’s necessary in this case to select theRounded Rectangle Tool (U) with 30 px radius. Represent the figure by pressing the Shift button and use simultaneously the Ellipse Tool (U).
Blending Options>Gradient Overlay:
Using the same method, try to make one more figure inside the already made one:
