USB Coffee Roaster Machine Coffee Bean Roasting Baking Machine Electric Motor Engine Accessories For DIY(220V 110V motor). Home use or outdoor use both.For outdoor use, you need connect device to a 5V power bank. For home use, you need connect the device to a phone charger, then in with AC power. 1 set= 1pc 385 motor+ 1pc power supply Output volt. 24V Max. Feature: rotating speed is adjustable by adjusting the voltage of the power supply You can use the engine kit with this machine:Far Infrared Heating Coffee Roaster Farbe:220V 110V motor