The Fresh Roast SR540 features a 4.5 ounce green bean capacity, so you can roast enough coffee for 20 cups in one batch. The SR540 features a new, larger display, and an improved glass chamber for better roast visibility. This updated model has nine heat settings and displays real-time temperature readings. The control knob easily adjusts all functions, including variable controls for fan, temperature and, time - valuable tools for the novice or advanced roaster who wants to tailor their roast to perfection!Product Specifications: Variable convection fan control Temperature control 9 settings for roast control Time control Precise digital time display Adjust temperature and time without interrupting roasting cycle Heat override switch to fine tune your roast without interrupting roasting cycle Roast beans enough for 20 cups in under 10 minutes Easy to use for novice and experienced roasters Speed Roast fluid motion system ensures fast, even roasting Roast any coffee, light or dark! One-year manufacturer warranty.