Using this paper towel dispenser is easy. First, open the dispenser and insert an 8 - inch or 9 - inch wide standard towel roll, up to 800 feet long. You can also use stub rolls for continuous use. Close the dispenser. When you need a paper towel, just wave your hand near the sensor, and it will dispense a pre - set length of towel. Make sure to keep the sensor clean for proper operation. As for maintenance, when the dispenser stops working, check if the batteries need to be replaced. You should use 4 D - size batteries, which are not included. Regularly clean the exterior of the dispenser with a soft, dry cloth to keep it looking good and functioning well.