Handle- turning handle clockwise releases the c02 into the water</br>Cartridge window- transparent?? allows you to see cartridges</br>No electricity required</br>Cartridge door release button</br>Makes up to 1.5l Of soda</br></br>Product Description</br></br>With the big boss soda boss you can now make your favorite soda right at home. Just twist and fizz! no electricity required and it includes 10 recyclable c02 bullets/cartridges. Soda boss is easy and convenient just fill and place bottle into soda station?? twist the handle to carbonate and add your favorite flavor.</br><br/>http://www.amazon.com/gp/product/B00M1M9W04