The skylight makes it easy to see when it is time to change the refill, which is 1200 ml in volume. Batteries are included. You don't need to touch as it automatically dispenses the perfect amount of foam soap you need for hand washing in one application. With this, it helps reduce the transfer of germs. It can hold a 1200ml refill cartridge. 30,000 uses from three standard C-size alkaline batteries (included)
