The Sentinel II is a fully integrated "Life Support Monitoring Device" for fire fighting SCBAs. It is both a cylinder pressure indicating gauge and an integrated PASS warning device with visual and attention demanding (>95 dBA) audible warning system.

The current cylinder pressure is indicated on a dual analog/digital backlit gauge. The Sentinel II automatically calculates and displays real time to the low-pressure alarm based on the user's actual consumption rate.

Two high-intensity flashing lights and a loud "chirping" alarm are used for the low-pressure warning signal.

All data is recorded and stored within the Sentinel (time/date, cylinder pressure, breathing rate, alarm activation, and thermal absorption temperature) and can be downloaded at a later time.