Its trick is the use of motors outside of the wheels, using a friction drive rather than gears or belts. The design allows the chair to be folded to thirteen inches without removing anything, including the batteries. It can also change quickly between manual and power with the flick of a switch. This is clearly their little corner of the market. Many small producers customize each chair, building it exactly to order.
Some noteworthy examples follow.
The HiRider from Falcon Rehabilitation is a power chair that can stand you up. It's not a standard chair. We don't have them sitting on the shelf. The HiRider is popular with golfers. Falcon offers optional wheels that won't damage the grass, and a hookup that allows the chair to be towed by a golf cart to preserve battery power, as well as many other options.