The Bosch Microwave Combination Oven Features Heavy Metal Stainless Steel Knobs.(BR)(B) (/B)(BR) (UL)(LI)Microwave Oven: For Additional Details Please Review SKU HMB50152UC(/LI)(/UL) Design (UL)(LI)Heavy-duty Metal Knobs(/LI)(/UL) Performance (UL)(LI)10 Microwave Power Levels(/LI)(LI)Genuine European Convection for Even Baking Results on Multiple Racks.(/LI)(LI)Temperature Conversion for Convection Cooking(/LI)(/UL) Efficiency (UL)(LI)EcoClean(TM) 2-Hour Self-Clean Cycle(/LI)(/UL) Convenience (UL)(LI)One Oven Light to Better Monitor Cooking Progress(/LI)(LI)Extra Large Door Window for Easy Monitoring of Cooking Process(/LI)(LI)Star-K certified. 100(degree)-450(degree) F(/LI)(/UL) Capacity (UL)(LI)Large Capacity at 4.6 Cu Ft.(/LI)(LI)Recessed 8 Pass Broil Element for Increased Capacity and Safety(/LI)(/UL)