This demonstration video goes over the features of the Hollis DG02 Air/Nitrox Wrist Computer. The DG02 Computer is a fully functional air/nitrox dive computer. It features a visual ascent alarm and button/water activation. For night dives, the DG02 features a power backlight that allows you to see the computer face easily. The DG02 has diver-replaceable batteries that are easy to install. This computer is depth rated to 330 feet.