Product Description TheTwo/Four/Six-Deck Automatic Card Shuffler is a superfast way to shuffle cards, so you can get back to the game in no time. Simply load half the cards to be shuffled into the left side, half into the right side. and push one button. Within seconds, your cards are shuffled and ready to deal. Works with up to Two/Four/Six decks of standard poker-sized cards or narrower bridge-style cards. Ideal for children, seniors or anyone who finds it difficult to shuffle cards. Cards not included. For all standard size cards Shuffles six decks of cards in seconds Battery operated Batteries not included Cards not included Machine that automatically shuffles playing cards Can shuffle up to six decks of cards at a time Accommodates either standard-sized or bridge-sized cards,Runs on four C batteries Playing cards and batteries sold separately This unit will function using a Poker sized deck of cards or cards stating a size of 3.5”H x 2.5”W. and Bridge sized cards are 3.5”H x 2.25” W If cards are not being shuffled on one or both sides simply sliding the gear back in place, making sure that the gears are lined up (in such a way that all gears are touching). Kindly refer the user manual attached below for instructions.