Easy to Use: You can put the cards in the 2 openings and they will be shuffled and come out of a tray and automatically shuffle your cards with the push of a button (up to 2 decks of cards). Note: If it doesn't work, after removing and bending the switch contacts and bending all the battery contacts, try installing the battery again,it works fineAutomatic Card Shuffler: Features innovative gears on each side to smoothly and accurately feed the playing cards into the tray. Requires 4 AA batteries (not included)Lightweight and Convenient: The automatic card shuffler is made of high quality plastic, durable, strong and light weight. Battery operated, very convenientWide Applications: The card shuffler is ideal for everything from poker, texas hold em, and blackjack to trading card games, fits standard sized cardsAvoid cheating: Now you can avoid the hassle of cheating or insufficient shuffle disputes with this handy card shuffler. Electric shuffler easy to carry, you can use it at home, office or anywhere you like