Guangzhou Bansheng Electronic Co.Ltd is the manufacturer of Rockwheel self-balancing electric unicycle .Our factory is located in Baiyun District ,Guangzhou ,China.Rockwheel is the most powerful and the lightest self-balancing electric unicycle in the world.Please feel free to contact us ! Add: No.88,Meigang Road,Meihuayuan,Baiyun District,Guangzhou City,Guangdong ,ChinaMain parameters of Rockwheel:1. Size of wheel :12 inch2. Max speed:>20km/h3. Crusing range:>30km4. Weight:8.6kg5. Climbing angle: 45 digreesPlease see our product video on Youtube