3 Levels Brightness: This LED desktop alarm clock with three sets of alarm clocks has 3 levels brightness adjustable function and it is controlled by button This digital clock is powered by plugging into the USB port, note that it is not shipped with batteries, you need to prepare your own 3xAAA batteries This digital clock for both tabletop and hanging on the wall is widely suitable for home,, cafe, restaurant, gym, and so on And it is also a great gift choices for families and friend Quiet Clock: This eye catching alarm clock works precisely and mutely, creating a comfortable environment, great for bedroom, living room, dining room, and so on This digital timer can count down, help you accurately time and effectively manage your time Easy to hanging and secure placement