All restraint systems include four high strength, quality retractors ready to be mounted on L Track hardware (not included). There is no manual tensioning required with these wheelchair tie down systems. The QRT MAX has its own self-tension device for easy securing. The simple one hand operation of the L Track takes less time and is more convenient. Also featured on the QRT MAX is a red line indicator to tell if the securing device is locked. When the red line is broken the device is not locked. When the red line is complete the device is locked. The QRT MAX L Track provides a short securing time and safe travel.