Touch-free sensor detects user's hand to automatically dispense controlled amount (0.8 ml) of soap; activation range is 4" from sensor lens. Bright-polished chrome spout cover dispenses 1,000 handwashes per 800 ml or 2,000 handwashes per 1,600 ml OneShot soap refills (sold separately). Requires four D Cell batteries (not included). Maximum countertop mounting thickness is 2" and contains a spacer for use with sink rim 0.75" or greater.