A5:(8.5x6x0.12inch) this size is a little small,just for children as toy can not be used as a professional painting tool A4:(13x8.5x0.18inch) this size can meet the basic drawing requirements A3:(18.5x13.5x0.4inch) this size is the biggest one which can meet more professional drawing requirements If you have any questions before or after the purchase, just send us message. Our products may not be the best, but we definitely provide you with quality customer service. Specification:Color: white + black borderMaterial: Acrylic Line length: 200CMInterface type: micro USBVoltage: DC 5VBrightness: 5000K --- 6500KWaterproof rating: IP65How to use: press the switch to open, hold the switch for a while, you can dim 1. Super Slim Light Board2. With a compact and elegant light box design, Light Pad brings Manufacturing technology to a whole new level.3. Eyesight-protected Technology4Super bright LED lamps provide a perfectly even illuminated surface thats perfect for scrapbooking, calligraphy, sewing, quilting, stenciling, and more.5.Adjustable Brightness6.Once its connected to the power, you can adjust the light by simply touching the switch till you satisfied.7.Larger as A4 paper,portable,easy to carry. Packing List:1 X Copy Table LED Board1 X USB Power Cable