From the product description, check product page for current description, price and availability:

If you’re a coffee roasting nerd like us, then this is the home roaster for you! The SR540 is the newest addition to the SR family and comes with a ton of upgrades and new features. A whopping 80% of the components have been upgraded, including new control boards and fan. The heat, fan, and time can all be adjusted by simply pushing in and turning the knob. The SR540 features a real-time temperature read out, allowing you to quickly check the current temperature with a quick turn of the knob. Instead of a general Low, Medium, and High temperature setting, this unit features 9 levels of heat adjustment. If you want to take your home roasting to the new heights, don’t sleep on the Fresh Roast SR540!

• 120 gram / 4.2 ounce roast capacity (apprx. 4 scoops)
• 9 level heat adjustment
• Easily control heat, fan, and time settings
• 120V power

Please note: overall roasting time may vary depending on your household outlet’s voltage rating, as well as the overall size, density and moisture content of the beans.