Automatic card shuffler shuffles up to 2 decks in seconds! Just divide deck and put one half on each side of the card shuffler. Cards must lie flat to ensure smooth operation (flexing a new deck will help cards feed properly). Once cards are in place, push down the bar on the front to shuffle the cards. Once cards are shuffled, pull out card receiving tray to remove cards. To install batteries, open battery compartment on underside of card shuffler. Insert 2 "C" batteries, not included (be sure to position batteries correctly, or cards will shuffle out) then replace battery cover. Measures 8.75"L x 4"W x 3.5"H.