Baby Brezza Formula Pro Advanced is the most advanced way to automatically make a warm, formula bottle instantly. No measuring, no mixing and no fuss. You can customize the perfect bottle for your baby by choosing 1 ounce increments between 2-10 ounces, 1 of 3 temperature settings or dispensing water only. It works with virtually all brands of formula and all bottle brands and sizes. BPA-FREE. NOTE: The level will appear higher than the ounce size selected because of added powder volume and/or variance in bottle markings. For Example: 4 Ounces of water plus powder volume is approximately 4.5-4.75 Ounces depending on your formula powder type.