Auto Belay acts as a specialized device common in many gyms that takes the place of a real live person on the other end of the rope. Set up above a particular route, this automatically takes in slack as you move up. This also takes up slack as you climb, thereby negating the need for a belayer on the ground. Auto Belay is categorized by the technology they use to control a climber's descent. When the climber reaches the top, or if they fall, the device automatically catches the climber and slowly lowers them to the ground.