? Blockage Prevention and Easy Cleaning? The coffee bean grinder comes with a built-in brush to prevent blockage and a removable ring burr for easy cleaning. Remember to keep the conical burr dry before reassembling to avoid short circuiting. ?? High Quality Stainless Steel? – Aromaster’s stainless steel burrs are ground evenly and slowly to reduce heat generation and preserve the original flavor of the coffee. ? After-sales Guarantee? Please note that the burr coffee maker requires a voltage of 120V, 60hz. We value your feedback and are eager to hear from you.