SpeedControl Dials used with SmartDrive MX2+ Power Assist Devices may be unresponsive to users and fail to stop or start unexpectedly, causing injury

http://www.fda.gov/medical-devices/medical-device-recalls-and-early-alerts/recall-alert-max-mobilitypermobil-removes-all-speedcontrol-dials-used-smartdrive-mx2-power-assist