The Primal Descender Device lets you down easy if you fall. This device provides an automatic, hands free, controlled rate descent and works with your existing full-body harness (harness must meet ASTM standards for fall arrest system). Features up to 25â?? of descent. Includes 1 tree strap, 1 descender, 1 carabiner. One time use for customer safety. Weight capacity is 120 - 300 lbs.