High-speed pressure cooking preserves flavors and nutrients Pressure regulator automatically maintains the proper cooking pressure Protective features include pressure release devices and a cover lock that keeps cooker from being opened until pressure is reduced Includes a stainless steel rack and a 64-page instruction/recipe book. Fully immersible and dishwasher safe Tri-clad base is made with a layer of aluminum sandwiched between two layers of stainless steel. extended 12-year limited