The device is powered by a removable 48-volt lithium battery. The battery charge time is four hours, according to the site. The device is offered in 26-inch bicycle wheel size but the company said it plans to add more wheel sizes in future releases. The company also said that, while presently selling only the wheel, it will soon sell both the wheel and bikes already equipped with the Copenhagen Wheel. All actuation of the wheel is automatic by way of the pedals, through sensing and control algorithms.
When the rider pedals harder, such as when going uphill, the Copenhagen Wheel pushes with increasing power. The product gets especially interesting when used along with a smartphone though the wheel can work without a phone.
Read more at: Phys.org