This is the remaining pressure alert from DIVEWAYS. Simply attach it to the high-pressure port, and you can use it for managing your customers' remaining pressure or for your own safety management. When the tank pressure drops to the set pressure of 50 bar, it alerts the diver with bubbles and a buzzer sound. You can clearly check not only when you neglect to check your own remaining pressure, but also when your buddy's remaining pressure is decreasing, using both your eyes and ears. The amount of air consumed to produce the bubbles and sound is extremely small and negligible. Furthermore, the function can be stopped or resumed with a single button operation after it starts. It prevents you from accidentally running out of air.