Ключевые слова: buttons, circuit, circuit component, circuitry, circuitry elements, control, control panel, control panel elements, controls, device, device buttons, device controls, device toggle, digital interface, electrical, electronic components, electronic control, electronic device, electronic switches, electronics, functionality, gadget, gray surface, hardware, hardware switch, interface, led indicator, led indicators, machinery, machinery buttons, off, on, power, power button, power buttons, switch, switch interface, switch panel, switches, technology, toggle, toggle switches, user interface, user interface components,