Huion LED Light PAD ultra thin 5mm Drawing Box Copy Tracing Stencil Tattoo Board Table with Multifunction Holder, Drawing Board Clip, 6 PCS of Tracing Paper (L4S Holder) ADJUSTABLE BRIGHTNESSKeep pressing the power button to adjust the brightness. EXTRA SLIML4S light box measures only 5 mm of thick which is very easy for you to carry. USB CONNECTEDPower supplied by computer or adapter. ( tips: User need to buy an adapter in addition. MEMORY FUNCTIONSmart memory brightness of your last use. PORTABLE HOLDERIt is suitable for Huion tracing light table LED light box.