Ideall Portable USB LED Touch Switch Lighting Detachable Base Desk Lamps Book Reading Laptop Lighting With Battary and USB Dual-Power Build-in USB 2.0 Port 1.Touch Sensitive Conrtrol Panel: ON/OFF with a simple touch.No more energy-wasting and you don`t have to unplug every time. 2.Detachable light head: Replacement design of different types of lamps for your preference.To direct light where you just want it .by adjusting 360-degree turntable light head easily. 3.10 high quality and high brightness LED light provided diffused & even light spread to alleviate burden for the eyes. 4. 3 power supply ways: USB mode-plugs into laptop/PC USB port; AC mode- AC power plugs; Battery Mode - 2 AA Battery ,great for outdoor activities and traveler. 5.USB extension function: LED light base is equipped with a USB port for data and power transmission.