This multi-purpose belay/rappel device is ultra-light and intuitive to use. V-shaped friction channels with asymmetrical lateral grooves adapt the friction to the type of rope for better control (ARC technology: braking control for twin, half and single dynamic ropes). Reverso mode for belaying one or two seconds with assisted braking. Ultra-light design:- minimalist construction- hot-forged aluminum- Weight: 57 g A single device for all rope types:- effective braking on half and twin ropes ≥ 7.5 mm- effective braking on single ropes ≥ 8.9 mm- can belay the leader, one or two seconding climbers and can be used for rappelling- independent and simultaneous belaying of one or two seconding climbers in Reverso mode- quick changeovers from Reverso mode to belaying the leader when climbing multi-pitch routes V-shaped friction channels:- increased friction on thin ropes- friction is adapted for larger diameter ropes- increases the locking pressure on the ropes in Reverso mode Asymmetrically grooved sidewalls:- increased braking power during a leader or top rope fall or while rappelling- rope slides smoothly through device when taking up slack Carabiner hole allows the loaded device in Reverso mode to be easily and gradually released with only a carabiner Rope friendly, allows for smooth belaying and rope handling:- will not kink the ropes regardless of the mode used- separates the two strands of rope when belaying and rappelling Intuitive use:- Reverso mode aluminum attachment point is easy to identify- keeper cable keeps the device from moving up the rope when belaying and reduces chances of losing the device- usage diagrams (standard belay and Reverso modes) engraved on device Use with symmetrical locking carabiners (Am'D or WILLIAM) to maximize efficiency Specs Weight: 57 g Rope compatibility: for use on half ropes & twin ropes ≥ 6.9 mm and single ropes ≥ 8.5 mm Material: Hot forged aluminum body.