The scanner glass has a conductive coating to prevent accumulation of static electricity. Since paper dust does not easily adhere to the scanner glass, scan errors decrease and the cleaning cycle can be lengthened. Double-sided scanning of documents from business-card size all the way to A3 can be done with a single scan. Plus, double-sided scanning is done at the same speed as single-sided scanning. This eliminates the work of pre-sorting, and prevents pages from being missed when scanning. You can enjoy smooth scanning by aligning either the right side or the left side of the documents. This lets you simultaneously set various sizes of documents for scanning.