Using this soap dispenser is easy. First, install 4 D-Cell batteries (not included) into the battery pack. Then, insert the soap refill into the dispenser. When you place your hand under the dispenser, it will automatically dispense 0.8ml of soap. Keep an eye on the LED indicator. If it blinks red, it's time to refill the soap. If it blinks yellow, replace the batteries. Make sure to use the soap refills available in 27-fl oz (800ml) or 54-fl oz (1600ml) capacities. The motor can be adjusted for different cartridge sizes. For maintenance, keep the dispenser dry as it has a water-resistant motor. Wipe the spout cover assembly with a soft cloth to maintain its bright polished chrome look. And remember, with its long battery life, you won't have to change batteries often - it can last up to 2 years or 100 soap refills.