The Invacare Storm Series 3G Torque SP Power Wheelchair features Invacare MK6i electronics which makes navigating a breeze. Optional Invacare Gearless Brushless GB motors help improve battery range. Rear-wheel suspension helps absorb significant jolts and impacts for smoother ride Easy-to-use MK6i electronics Optional Invacare TrueTrack technology keeps chair on truer forward path to lessen fatigue.