It can rotate 360 degrees to meet the needs of multiple angles., No external power supply,directly from the inserted USB port to take power;super energy saving, power consumption is less than 40mA; you can gently illuminate the keyboard without affecting the other people around;One high brightness white LED can guarantee the dark vision clear, Internet or network game when in the evening you, turn off the lights, in such a USB lamp protection direct eye fatigue, but also save electricity ;It can be used in notebook computers, mobile power supply, mobile phones.