Touch-free sensor detects user's hand to automatically dispense controlled amount 0.8 mL of soap, activation range is 4 in from sensor lens. Bright polished chrome spout cover dispenses 1000 handwashes per 800 mL OneShot® soap refills, requires 4 "D" cell batteries (not included). Maximum countertop mounting thickness is 2 in and contains a spacer for use with sink rim 3/4 in or greater.