Safe power souce with DC5V, which is a power saving design. Super bright but soft light offers brightness and softness for users. Flexible metal stand for easy adjustment. Fan can offer cooling to you at its best. Gives users enough lluminous llight meanwhile makes much protection for users’ eyes. The lamp has a long life of 50,000 hours. Lamp has got 13 LED to offer brightness. Switch for fan and lamp. Can be powered by USB on desktop, laptop, hub and with DC jack for using adaptor (110V-220V, 50-60Hz). Power efficiency: 2W Voltage: DC5V