Ключевые слова: adapter, analogue, appliances, automatic, automation, background, button, circle, clock, closeup, concept, connection, control, device, digital, disconnected, efficiency, electric, electrical, electricity, energy, equipment, home, isolated, light, modern, numbers, object, off, plastic, plug, power, round, set, sign, socket, stop, supply, switch, symbol, technical, technology, time, timer, turn, turning, universal, voltage, white, wireless,