Its intuitive operation and clever handling make the Smart equally popular among both indoor and sport climbers. It dynamically brakes the climber in an accidental fall and locks even at low levels of force exerted by the user. In situations where the user has a sudden shock, the function corresponds to the reflex movements of the human body. The improved geometry of the carabiner opening allows comfortable releasing of the lead climber. Suitable for all current HMS carabiners and single ropes from 8.7 to 10.5 mm in diameter.