Wheelchair users who have limited upper limb function or those who routinely encounter difficult terrains will benefit enormously from a wheelchair drive assist. The Xtender wheels from Sunrise medicals features motorised rear wheels that increase the force you apply to the hand rims by 4 x times! This increases your range of mobility by reducing energy expenditure by as much as 45% and decreasing the burn of fatigue, while still allowing you to maintain the look, control, and functionality of a manual wheelchair. The Smart Drive is another innovative product that has created a buzz in the wheelchair drive assist market. They are easy to use and replace the need for wheelchair propulsion altogether while still allowing you to control the manual wheelchair on your own.