REVERSO - How to belay & rappel

REVERSO :
http://www.petzl.com/en/outdoor/belay-devices/reverso-3

A belay device for the leader or the second, descender. For use with single or double ropes.

* Multipurpose device: belaying the leader, one or two seconds, or as a descender.

This video is non-exhaustive. Please refer to the REVERSO sheet for more informations about the product.
http://www.petzl.com/en/outdoor/belay-devices/reverso-3