We got this for my mom when she had MS. By the time we got it she wasn't able to even sit up and never got to us it. It has been sitting here ever since then. It is a Quantum Edge It has an air tank holder, controller for assistance on the back, adjustable head rest, arm rest that lift, cushion sit, cup holder.  It has a screen next to the joystick the allows you to see the functions as well as the battery life. Ability to change the position of the chair angles.  Large center wheel and 4 stabilizing wheels to give control outside and the ability to mark sharp turns and ability to go thru mud, sand or any other off-road trip. It also has a battery charger. I also have a rack to attack to the vehicle for transporting.  I'm looking to get 4,500 for it but willing to talk over a different amount.