Self-braking system: if the rope suddenly comes under tension (e.g. in a fall), the cam pivots to pinch the rope, thus helping the belayer stop the climber"s fall. Usage is similar to that of conventional belay devices: giving/taking slack is done by using both hands to slide the rope through the device; falls are held by holding the free end of the rope; for lowering and rappelling, the rate of descent is controlled by the hand holding the free end of the rope (the rope is released with the handle).