Aeris Elite T3 Hoseless Air Integrated Dive Computer with Transmitter and USB... Air, Nitrox, Gauge and Free Dive Modes | Buddy Pressure Check Switch between up to 3 independent transmitters, tracking up to 3 Nitrox mixes to 100% O2 Personal Conservative Factor Adjustment | Custom Audible Alarms with Flashing Red LED light Alarm Acknowledgement | Adjustable safety stop time and depth | Backlight with user-defined duration Complete" unit (P/N 10.5712) includes ACI PC Download and Settings Upload Software and USB cable