The Wafer is only 0.8cm (3/8") thick. The tracing area measures 32cm x 23cm (12.5" x 9") - easily fits A4 & US Letter. The Wafer has dimmable LEDS and provides an even spread of light from edge to edge. It is powered by Mains/AC Adapter and is very low heat. Wafer is ideal for calligraphy, stenciling, scrapbooking, embossing, quilting, embroidery, sewing, stained glass and much more. 120 volts.