Primo Flavorstation FSS Liberty 120 (Black) Requires no electricity - Ideal for everyday use. FSS Technology allows you to choose the sparkling intensity of your beverages by turning a dial on the appliance. CO2 release is controlled so none will go to waste. The FSS technology is also significantly quieter than competitive brands. Fast mounting Sparkler connection, No repetitive threading. Bottles feature bayonet connection that is fast, easy and secure. Compatible with 0.5L and 1.0L bottles.