Using your Bradley 6315-KT Touchless Hands-Free Soap Dispenser is a breeze. Just wave your hand under the dispenser, and it'll release the soap. When the LED turns red, it's time to refill the soap. You can use either the 27-fl oz or 54-fl oz soap cartridges. If the LED turns yellow, replace the 4 D-Cell batteries (not included). The dispenser fits countertops with a 1-inch diameter hole and up to 2 inches thick. To maintain it, clean the spout regularly with a soft cloth. The motor can be adjusted to fit different cartridge shot counts. Enjoy the convenience and hygiene this dispenser brings to your food service or medical area.