XR NITROX:

course that allows you to make decompression dives, up to 15 minutes max, at a maximum depth of 40 meters.

XR EXTENDED RANGE:

course that allows you to make decompression dives, up to 25 minutes max, at a maximum depth of 45 meters.

XR INSTRUCTOR:

this license allows you to certify your students with XR Nitrox License and XR Extended Range License.