Hottop 9oz Programable Model: B Coffee Roaster + 3lbs free green coffee The "B" model only has a single thermocouple for roasting chamber temperature. It can save roasts to memory for recall. The "B" models is designed to roast beans by time You will have full control over total roast time, target roasting temperature to end, fan speed, and heater power. These can be easily changed during the roast. The combination of variables that are subject to programming changes are virtually infinite. Accurate K-thermocouple. Temperature, time, and fan speed can be programmed and monitored at any time. Can store (and re-store) three roast profiles. Auto mode allows simple operation without programming, just like older models. Digital display & measurements