http://www.fixehardware.com/sum-self-br ... device.htm
Safe, for all your sport-climbing ropes, resistant, ergonomic, dynamic, light and easy to use! Sum is a new generation belay device/descender designed to belay the first and the second in sport-climbing routes or climbing-walls. You can give rope fast and easy without touching the lever.
Its symmetry makes it user friendly for left-handers.
It offers dynamic braking which gives good absorption for the first-ascender.
It is very easy to place the rope.
It comes with a “Belay Positioner” which assures that the carabineer always works in the correct position.
Special uses: Rescue, Zip-lines, Ascender, Abseil.