i-MuLED Portable Eye lamp.it is can be Used with The Computer USB, Power Adapter, USB Socket, Mobile Power. 1. The light brightness could be controlled by the grooves touch switch. &lt;br/&gt;There are 3 gears of the light: Touch once for low light/ Twice for medium light/ Thrice for high light/ 4 times for turning off the light. 2. When touch the reading lamp to adjust the gears, please make sure your fingers are fully contact with the plastic on the circle. 3. When the touch reading lamp works for long hours, do not touch the metal heat sink, in order to avoid burns.&lt;br/&gt; When adjusting the light of the touch reading lamp, do not bend it excessively.&lt;br/&gt; Do not let the touch reading lamp in contact with water / fire. 4.This product abandons the traditional form of metal wrapped for USB interface. You would feel more comfortable with its simple plug which can be inserted into USB ports of a variety of adapters, mobile power, computers. Stable power supply, ease to use. Featured thermoplastic elastomer TPE, with superior "plasticity". &lt;br/&gt;Line body could be bent freely and you can change the angle according to your different needs. 5.Acrylic shade helps soften the light, avoiding the damages caused by direct light to your eyes. The soft light illuminates the keyboard, books etc. You don't need to worry about influencing others, but also better protecting your eyesight.