Features:1. Fits wheelchair width of 36-51cm (14-20″)2. Twin drive wheels for greater traction3. Dismantles easily for easy transportation and storage4. Easy to operate hand control lever5. Variable speed setting with reverse6. Security key switch7. Removable battery pack for remote charging8. Lifts out of use to enable normal wheelchair function9. Suitable for users up to 136kg (21 stone) The unit is intended to be an aid to attendants or carers whilst pushing a wheelchair user. It is not designed as an accessory to enable a manual wheelchair perform as a power wheelchair.