This demonstration video goes over the features of the Aeris Epic dive computer. It is an air/nitrox integrated hoseless diving computer that can switch between up to 3 independent transmitters, tracking up to 3 nitrox mixes or your buddy´s tank pressure. It has many modes including a free dive mode, a gauge mode, and a dive mode. Another great feature on the scuba computer is the user changeable battery. There is no need to send the computer in to replace the battery..