The Rollgliss™ R550 controlled descent device offers the choice of controlled descent rescue, evacuation or the versatility of assisted rescue with lifting capabilities. This fully automatic device features a 2-3 ft. per/second (0.6-0.9 m) descent speed. Provides rescue and evacuation from heights up to 1,640 ft. (500 m) for one user 310 lb. (140 kg) or 575 ft. (175 m) for two users totaling 620 lbs. (282 kg). Its unique bidirectional design allows one end of the lifeline to descend while the other ascends, ready for another rescue.