The Quadra can change instantly from one mode to another while under load. A special braking mechanism increases the frictional force for lowering heavy loads. This device will arrest a 2 person fall factor by 1/3 when in life lining mode with no rope damage. It will also retain full function after a fall. Recommended for use with PMI Access Pro rope. Weight 24 oz. (680 g). Made outside the U.S.A.