No need to wait for the full-size oven to preheat, the Oster TSSTTVF815 convection oven gets meals started and on the table quickly and efficiently. Whether it's 6 bagel halves for breakfast or a pan of lasagna for Friday night dinner, this powerhouse performer delivers. Upper and lower rack guides allow for multi-level cooking options. The heat adjusts up to 450 degrees with easy-to-read numbers that indicate the temperature settings in 50 degree increments as well as Bake, Turbo, Broil and Toast functions. At the end of cooking time, the timer's bell will signal and the oven will turn off automatically.