The design of the flashlight emphasizes gesture simplicity and redefines the usage of diving flashlights.
The flashlight has LEDs from both sides. In the front, there are 4 modes of light: weak, medium, strong and SOS. The back side has 2 communication signal modes: red & green light. The communication signal is for letting the other divers know if everything is OK instead of using hands signals to catch their attention.
As part of my research, I did a benchmark on diving flashlight that were selling at that time. In addition, I learned about how colors disappear underwater as you go deeper.