Hunter Safety System Reflective Tandem Lifeline with 2 Prusik Knots and 2 Carabiners SAFETY FOR TWO PEOPLE: Allows you and a companion to remain attached to the same LifeLine ALLOWS SILENT ASCENT AND DESCENT: New 2015 design features cowbell silencers that eliminate any clanking noises from carabineers that might scare game QUICK AND EASY SET-UP: Simply strap to the tree when hanging the stand, tie it off at the base of the tree and leave it there for the season EASY-T0-FIND IN THE DARK: New 2015 version features reflective material that &ldquo;lights up&rdquo; with the slightest flashlight beam to locate your treestand in low-light conditions VERSATILE: All Lifelines accommodate treestands up to 30 feet high