The Mammut Smart Alpine Belay Device. The alpine version of the award-winning Smart can also be used with half ropes as well with single ropes, making it the ideal companion for all alpine rock and ice pursuits. When it comes to belaying, the Smart Alpine offers the same excellent qualities as the Smart: dynamic braking of the climber in an accidental fall, and locks even at low levels of force exerted by the user. The Smart Alpine can also be used to independently belay one or two second climbers in an autolocking mode from the fixed point. The device is also ideal for abseiling. Black-red version for use with rope diameters of 8.9 - 10.5 mm. Features of the Mammut Smart Alpine The alpine version of the award-winning Smart can also be used with Half Ropes as well with Single Ropes, making it the ideal companion for all alpine rock and ice pursuits Dynamic braking of the climber in an accidental fall, and locks even at low levels of force exerted by the user Can also be used to independently belay one or two second climbers in an auto locking mode from the fixed point Ideal for abseiling Black-red version for use with rope diameters of 8.9 to 10.5 mm, Silver-red version for use with rope diameters of 7.5 to 9.5 mm *Please note that this is NOT a in. hands-offin. belay device. The brake-end of the rope must be controlled at all times, and this is merely an in.assisted braking devicein., where the device will function in a way that a portion, not all, of the braking power is done by the device itself. Also, the device is not intended to hold the rope with a 100% positive in.stopin., as there is some slip built into the device to facilitate a dynamic belay. Sorry to be so mean about it, but this is super serious stuff.