Makes fresh sparkling water at the push of a button. We're upgrading to a larger unit so we're selling this one. Includes: Sparkling Water Maker and a 1 Litre BPA-free reusable carbonating bottle Energy efficient, powered by CO2 cylinder (not included) Each cylinder carbonates up to 60 litres of water Compatible with all SodaStream flavours and SodaStream 1L Classic carbonation bottles (BPA free and better for the planet)