QMS escalators are designed for safety, quiet operation and high comfort. QMS escalator technology comes from the world leader in the industry. The QMS escalator has all the advanced features needed for human safety and comfort. It has a phase monitor, step chain contacts, hand access control contacts, comb contact, emergency stop button, rear step lock that regularly monitors the operation of the escalator and turns off the brakes immediately if any obstruction or malfunction occurs in the system .