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A smartphone lying on a wooden surface with a white background, positioned with the screen facing upwards and turned off. The visible bottom part has a central home button and speaker grills.
LED ceiling light with smart remote control. Energy saving. Clean planet and environmental protection.
Close up of hand of woman turn off on lighting switch at home room. Finger pushing light switch turn on or off white switch on wall for saving, control power electrical energy, eco environment concept
Close-up unrecognizable smart girl student reading book near bookshelf in university library young woman reader holding textbook turn pages read literature doing research preparing for college exam
Air conditioner temperature is set at 25 degrees Celsius to save on electricity bills.

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