First degree:

We offer this product with a DIN configuration.
Suitable for use in water temperatures below 10°C.
Unique Overbalanced Diaphragm Design – As the diver descends, the overbalancing feature allows the medium pressure gas in the hose to expand at a faster rate than the ambient. This results in superior performance at depth.
HP ports are angled for optimal hose routing and transmitter mounting.
Ribbed diaphragm clamp for improved heat transfer in cold water conditions.
Double swivel hose for greater freedom of movement and comfort.

Second degree:

Highly efficient, pneumatically balanced.
Large, dive-friendly self-flushing purge button.
Large protectors on the sides and top to protect the second stage from impacts and scratches in the most vulnerable areas.
The Comfo-bite reduces fatigue in the diver's jaw.
Double swivel hose.
The flexible nylon braided hose has better cold water performance than traditional rubber hose.