ZITRADES Multi-Function 3 touch Step Brightness Control LED Desk Portable Eye-Protection Lamp With ultra-thin White BY ZITRADES Lamp holder of ultra-thin design visual aesthetics,ZIT502 Lithium included. Provides natural, non-flickering, soft and uniform light 3 Touch type dimming design to meet the different needs Base interface of USB charging port for mobile phone, iPod, MP3 player, etc Patent plug-in unique design