Ключевые слова: alarm, background, black, business, circle, clock, closeup, concept, countdown, deadline, design, device, devices, dial, electric, electric socket, electro, electromechanical, energy, equipment, hour, hours, instrument, isolated, measure, measurement, mechanical, minute, modern, number, object, power, saving, scale, second, sign, socket, socket timer, stopwatch, supply, switch, symbol, time, timer, toggle, top view, watch, white,