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Look at the picture on the left side. When pushing the lampshade, the steel ball will get locked in the circular groove, turning the light on while the lamp attached to the surface of desk. Push the steel ball to get it out of the circular groove, and then the light will be off. With the force of the spring, the lamp will recover to the original state. Therefore, the air will be absorbed into the sucker inside, which results in its leakage, making it easy to take away. The LED bulb supports USB charging, with Low profile and nice exterior. Besides the features of energy conservation and portable lead to its widely use.