We’re glad you asked! The E-TERRA Sparkling Water Maker is an extremely convenient electric Sparkling Water Maker. The E-TERRA Sparkling Water Maker comes with an easy-to-clean, dishwasher-safe BPA Free carbonating bottle. It has a one touch electric carbonation, ensures consistency with 3 levels of carbonation to choose from – just plug in and enjoy illuminated carbonation experience and fresh sparkling water - at the touch of a button! The E-TERRA comes with our patent pending Quick Connect Cylinder that makes your cylinder connection easy and intuitive.