Pressurization Technology. Utilizes a specially designed mechanism that seals the can airtight, preventing the escape of carbon dioxide and maintaining optimal pressure User-Friendly Operation. Simple and intuitive operation for users of all ages. Just place the device on top of the opened can until you hear it click twice, pump the top until the can becomes firm when squeezed, and save for later Portable and Compact Design. Compact and lightweight design for easy portability, allowing users to enjoy fizzy drinks on the go without worrying about premature carbonation loss Eco-Friendly and Cost-Effective. Provides a money saving solution by reducing the need for consumers to discard half-consumed cans, ultimately saving money and reducing beverage waste Be Sure You Hear 2 Clicks When Installing. If you only press hard enough to hear one click, you will not have a complete seal and the product will not work. Press hard enough until you hear it click into place two times