The Baby Brezza AirSwirl Waterless Bottle Warmer is the most advanced way to safely and evenly warm baby bottles, using the same technology used by nurses in hospitals! It warms with only hot air – not water – so there's no bacteria or scale build-up inside and bottles are 100% dry when finished. The AirSwirl safely warms breastmilk without overheating, protecting nutrients, unlike traditional milk warmers that use steam heat which ruins breastmilk. The premium machine rocks the bottle during warming to ensure even warming without hot spots or air bubbles. This deluxe electric warmer warms so evenly and precisely, there is only 1° F temperature difference between the top and bottom of the milk during the warming process, while other warmers create 21° F temperature difference in bottles. The AirSwirl's rocking motion also mixes formula and water to the perfect consistency, so it doubles as an automatic milk bottle shaker. Perfect for warming bottles bedside. Choose your precise warming time based on # ounces, milk type and bottle material. Now featuring new & improved gentle touch buttons - the redesigned buttons are 100% responsive and easy to use! Select your settings based on # of ounces, milk type & bottle. The warming time counts down on the digital LCD display, then the warmer beeps and automatically shuts off when finished. Works with most brands and types of bottles, including glass, silicone and plastic bottles (excluding bottom vented bottles). Includes two rings that hold narrow neck and wide neck bottles. 1 year limited warranty (not valid if shipped or used outside the US).