The MADIC™ 9 is a reserve tank designed to store and dispense up to 9 shots of your favorite liquor. Made to take the place of your tumbler's lid, it securely fits nearly all 30oz stainless steel tumblers on the market. Untwist the button to fill the reservoir. When you're ready for a drink, the fun button, and the MADIC™ 9 will dispense ½ shot at a time down into your tumbler. Engage the Shot-Lock Switch to create a leakproof seal between your stored liquor and the tumbler until you're ready to mix your next drink.