Sharper Image Soap Genie Automatic Soap & Lotion Dispenser - Black Cordless! Runs on 4 "AA" batteries - about a year of normal use Automatic! Infrared sensor automatically activates the dispenser when hand is placed under spout. Adjustable! Choose amount to be dispensed using the easy access selector Fun! Musical sound effects signal that soap is dispensed. Can be muted. Holds 24 ounces.