Tingkam A4 Ultra-thin Dimmable Brightness Artist Tattoo Light Box LED ADJUSTABLE Illumination Tattoo Tracing Light Desk Pad Light A4 Light Box comes with qualified US power supply, which will avoid the flashing problem(most USB plugs have ) caused by unstable working current LED Light pad widely used in animation, stenciling, sketching & drawing, scrapbooking, tattoo transferring, sewing projects etc. Led light box has slim design thickness & light weight,so you can carry it where you go Adjustable brightness: A4 drawing light pad comes with touch switch to control brightness by pressing, super bright lamps inside light box illuminated surface perfectly LED Adjustable Light 50,000 hours life span,tracing light box produces little heat when using. And it is suitable with long hours working.(Notice: The Silicon ball and 4 magnets which may show in the old version of instruction wont come with the newest generation of light box)