Power units can be fitted to our 210kg (33st), 255kg (40st) and 266kg (42st) wheelchairs. The speed controller can be placed on the push handle so an attendant can control the speed of the wheelchair while guiding the chair. When a carer is guiding a patient in a wheelchair down a slope they will need to take the weight and restrain the chair to stop it from rolling away. This can be dangerous for a carer as they will be supporting the weight of the chair plus patient in a position that puts a lot of stress on back muscles. The power unit eliminates this risk by only letting the chair roll at a set speed or it will hold the chair still if required.