Smooth and quiet with a zero-start 4 HP (6 HP at peak) hi-torque drive. Low to the floor cushioned deck for patient comfort and safety. 22 x 63" (56 cm x 160 cm)running belt and safety handrails. Exceptionally accurate self-calibrating speed and elevation. Prominent emergencystop button and patient safety tether that, when used, will eliminate freewheeling by locking the belt for 45-seconds.