The unique U-Drive system converts the XS aluminium self propelled wheelchair, into a user controlled electric powerchair allowing speed of up to 4mph*. Travels up to 6 miles (10km) on a full battery charge. The U-Drive can easily be fitted or removed. The excellent P G Drives S-Drive Joystick provides true user control. Very portable, making transportation simple, when detatched, the U-Drive and wheelchair will fit in most car boots for easy transportation. Maintenance free & airline friendly 24V 12ah valve regulated sealed lead acid battery pack. On or off board charging.