REVERSO®, Versatile, lightweight belay/rappel device, for use with one or two rope strands and ability to belay a second climber from the anchor - Petzl USA
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Petzl Reverso Belay Device with William Screw-Gate Locking Carabiner | eBay
REVERSO®, Versatile, lightweight belay/rappel device, for use with one or two rope strands and ability to belay a second climber from the anchor - Petzl USA
How to belay the leader with a REVERSO - Belaying techniques - YouTube
Best Belay Devices for Climbing | Switchback Travel