The TGA wheelchair powerpack attaches to any wheelchair to provide powered forward movement. Simply walk behind with your thumb on the control and let the Powerpack do all the work for you. With speeds up to 4mph and a range of up to 10 miles, there is more than enough capacity for most days out. The pack is removable and light enough to load in to the car with the wheelchair. The standard single wheel is intended for level use whilst the twin wheel version is intended for rough ground or gradients.