Its intuitive operation and clever handling make the Smartequally popular among both indoor and sport climbers. Itdynamically brakes the climber in an accidental fall and locks evenat low levels of force exerted by the user. In situations where theuser has a sudden shock， the function corresponds to the reflexmovements of the human body. The improved geometry of the carabineropening allows comfortable releasing of the lead climber. Suitablefor all current HMS carabiners and single ropes from 8.7 to 10.5 mmin diameter.