From Smeg, this sparkling water maker features: Unleash your craving for effervescence with the Sparkling Water Maker. Designed to combine innovative functionality and distinctive design, making sparkling water is a simple, intuitive and refined gesture thanks to the uniqueness of its front knob. Fill the Tritan Renew bottle to the fill line, twist onto the machine and rotate the front knob clockwise 1, 2, or 3 times depending on the amount of carbonation you desire Untwist the bottle from the machine and your sparkling water is ready to serve While not included, this is compatible with the 14.5 oz CO2 canister with the standard screw type Simply lay the machine on its side to insert the CO2 canister in through the bottom of the machine and twist clockwise to lock into place There is a hidden My Smeg Assist QR code under the drip tray lid that will bring you to helpful videos It comes with 1 Tritan Renew 1 Lt bottle, additional bottles available for purchase. Warning: never carbonate substances other than pure water Do not add pieces of fruit, vegetables or herbs in the bottle before carbonation Stainless, plastic (ABS), aluminum, Tritan Renew  Hand wash Measures: 5.25" x 9.75" x 16.5" Imported.