Crock-Pot SCCPMD4-CH Hook Up Warming Tray Connectable Entertaining Slow Cooker System, Metallic Charcoal This unit plugs into other units included in the Hook up Connectable Entertaining System so you can mix and match units for any occasion Includes special cord that pulls out to use with standard outlets or stores inside the base to connect multiple units together Warming Tray is perfect for warming baked dishes, bread, pizza and more Features Low, High and Warm Settings for added convenience and flexibility Stainless Steel top is easy to clean