Use just one, both 2.5QT units, or add on more</br>Units link together with one power source</br>Two units included</br>Stackable for easy storage</br>Off/low/high/warm Individual temperature control lets you control each dish separately</br></br>Product Description</br></br>Cook, serve, expand, stack and store with BELLA LINX. The new and innovative design lets each unit connect together so you only need one power source. Versatile linking system allows you to cook 1 or 2 or more dishes at once. You can link up to six units and they stack together for easy portability and storage.</br><br/>http://www.amazon.com/gp/product/B00ESDVSTW