Fizzi™ is our classic model that doesn't require electricity to operate. By pressing the carbonating button in firm short bursts, you're able to control the amount of fizz from a gentle bubble to a stronger bubble blast. The One Touch™ is our electric model. It has 3 sparkle presets for automatic carbonation levels, so everyone in the family can easily prepare sparkling water to their taste. The Aqua Fizz™ is our premium model, and features a dishwasher safe glass carafe that's perfect for hosting friends and family.