This is the Oceanic Alpha 10 + CDX Scuba Diving Regulator 1st and 2nd Stage Features: All new pneumatically balanced second stage for smooth breathing Designed to respond to the natural inhalation and to reduce resistance Prevent free flow with the pre-dive switch. Just adjust the switch before you dive or in between dives to stop unnecessary free flow. The lightweight and compact Alpha 10 was designed to be easy to use, easy to service, and like all our gear, it was built to last. It comes with a lifetime warranty and free parts for life. Designed, manufactured, and tested in USA The Alpha 10 packs an advanced air delivery system into a tough and compact design. Its completed redesigned pneumatically balanced second stage dramatically reduces resistance, resulting in truly effortless breathing.