perforations on the paper towel and stops right at the perforated line every time making tearing towel sheets easy and mess free. It is easy to pre-set any brand and dispensing length desired. It is powered by 4 C size batteries that can last up to one year or 100 rolls of standard 80-sheet towels. Optional AC adaptor is available (purchase separately). It is designed for table top, wall mount or under cabinet mount. Brackets sold separately.  (less)