A belay device is a piece of equipment used to control a rope whilst belaying. The device allows the belayer to control the speed of the rope simply and efficiently. When used correctly after proper instruction a belay device will allow lighter climber to control the rope and when required a fall of a much heavier climber. Most belay devices work by looping the rope around a series of tight bends. The rope can be paid out or taken in as required. If the climber falls, the rope can be locked (stopped) to prevent the climber from falling any further than the amount of slack rope already paid out.
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