My husband bought this knee Walker with 175 US dollars in US when he was wearing a kind of fixed boot . This knee walker is not an electrical, The user can put the leg or foot with cast (got hurt) on the big seat, and walk or run with the other good leg and foot. It can be very fast. My husband knew knee walkers too late. He used walking sticks for 4 weeks after he broke his ankle 's bone. Then he got a fixed boot from the hospital then he knew knee walkers exist. There were not the 2nd person used this knee walker! I would like to sell it with 500 RMB.WE don't want our young daughter climbs on it and try to ride every day. *.*^.^