Warm tips: the product label may be 110V, but the physical object is 220V. Under different deceleration ratio, the output shaft speed is different. The output shaft speed is equal to the motor speed of 1350 rpm divided by the deceleration ratio.Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday.