The product does not have variable speed. It just turns off and on. The manual didn't help much and crumpled into a ball in the box. One of the front teeth was bent. It did not contain all the details, the goods were not only damaged during transport, but also with a manufacturing defect. It had protective packaging, but it was so minimal it wasn't surprising that it was damaged on the way to me. I contacted the company immediately and their response was invaluable. They said that if I agree to bring it to the store to be repaired and buy the missing parts they would be willing to refund me 35% of the cost.