The Single Wheel Solo Powerpack attaches to any wheelchair in literally seconds. Once fitted you will never need to push the chair again. Simply walk behind with your thumb on the control and let the Powerpack do all the work for you. The Solo Powerpack is the most technically advanced carer-controlled wheelchair power pack on the market. With speeds up to 4mph with up to 18 stone on board and a range of up to 10 miles per charge, there is more than enough capacity for most days out.