Features The Baby Brezza Air Swirl Waterless Bottle Warmer is the most advanced way to safely and evenly warm baby bottles, using the same technology used by nurses in hospital 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 warmers that use steam heat which ruins breastmil The machine gently rocks the bottle during warming to ensure even warming without hot spots or air bubbles It 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 Choose your warming setting based on # of ounces, milk type and bottle material It's easy to use the Gentle Tap Touch buttons to select your settings:just lightly tap, no need to press Update feature Warmer counts down on Lcd Display, beeps & then auto shuts-off when finished Works with virtually all bottles (sold separately) and includes two rings that hold narrow neck and wide neck bottles for a universal fitSpecifications Compatible with the following (sold separately): Virtually all bottles Manufacturer's 1-year limited warranty (not valid if shipped outside the Us)