This Summit (OTR24) Built-in Microwave is designed for complete enclosed installation and will fit in 20 21 or 24-inch cabinet spaces. Operating the unit is simple with the user-friendly touchpad controls that include presets for popcorn pizza beverages and also a Quick Defrost option. The clock/timer is also easily programmed and easy to read with a bright green digital display. The durable stainless steel handle matches the front frame for a sleek professional-looking finish. The mirrored glass door is tinted but slightly opaque allowing you to monitor foods at a glance when needed. The interior is finished in white with a rotating glass turntable for an evenly cooked meal every time. Note: The cabinet sides top and bottom are unfinished. The OTR24 requires professional installation and a finished cabinet (not included) for safe operation. Multiple Power Levels: Touchpad controls include settings for popcorn pizza and beverages as well as a Speed Defrost button for quick cooking. A clock and timer are also included all with digital display Mirrored Glass Door: The dark-tinted front panel is reflective for the most part but has a slight opaque quality for checking food at a glance Enclosed Installation: This particular unit is should be completely enclosed for safe operation and fits best in a 24-inch cabinet space. Professional installation is recommended