The ASAT automatic descending/rescue device can be used bidirectionally. When a person descended to the ground, another person at heights connecting the three-step lock at the other end with the safety harness, descends in a
constant speed without waiting. After passing the ASAT professional training, the automatic descending/rescue
device can be used to perform operations of stop, self-controlled ascent, rescue with both hands away from the rope, and so forth at any height.