Petzl - I'D S, Self-Braking Descender MULTIFUNCTIONAL HANDLE: Unlocks the rope and controls the descent with the hand on the free end of the rope; moves more easily on horizontal or inclined terrain, thanks to the button on the handle. ANTI-PANIC FUNCTION: Will activate if the user pulls too hard on the handle; it brakes and stops the descent automatically. ANTI-ERROR CATCH: Helps to reduce the risk of an accident due to incorrect installation of the device on the rope; he shape of the cam is designed to improve rope glide when ascending. SAFETY FIRST: The gate on the moving side plate helps prevent dropping the device and facilitates rope installation when passing intermediate anchors. TAKES YOUR SLACK: Pivoting cam facilitates taking up the slack in the rope; an also be used to make a progress-capture haul system, and for short rope ascents (by adding a FOOTAPE or FOOTCORD foot loop and an ASCENSION handled rope clamp).