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Battery operated only for Enery Saving. This wall clock is powered by 2-piece D-size or LR20 alkaline batteries (not included), the 3 inch LED time display can last up to one year. Brightness adjustment: This alarm clock has three levels of brightness you choose (high/medium/low) and the LED time display automatically dims during 8pm-6am. Note: (The watch is not recommended to be used in a very bright environment, as the time display is blurred and the numbers are difficult to read.) Large LED time display: The LED numbers are 3 inches high, can be easily seen across the room and allow you to see the specific time clearly from a distance. [Poratable and compact design] This type of LED clock can be hung on the wall or placed on the table, you can place it anywhere you want. It is perfect for living room, kitchen, bathroom and so on. [Premium Warranty] Watches are covered with a 90-day money back satisfaction guarantee and a 1-year quality assurance warranty.