A slotmach is a gambling device that generates a game of chance for its customers. Slot machines are also known as one-armed bandits because they were originally operated by one lever on the side of the machine as opposed to a button on the front panel, and because of their ability to empty a player's pockets and wallet as a thief would. Slot machines are typically programmed to pay out as winnings 82% to 98% of the money that is wagered by players. The remaining percentage is kept by the slot machine operator as revenue.