The USB Power Supply Desk Lamp with Clip Holder has definitely become a favorite amongst students! These are powered by a USB power supply so making it super convenient to hook this to any USB port on your laptop/ computer or even a USB bank. It comes with a flexible metal tube that is easy to adjust to any direction. It also comes with an ON/ IOFF switch - how handy! Wattage is 3W and the cable length is 118cm.