This is the Sherwood Amphos Air 2.0 Scuba Diving Wrist Computer Features: Four Operating Modes (Time, Dive, Freedive, Gauge) Air Integration Two Gas (21-50% and 21-100%) Independent PO2 alarm settings for each gas DSAT Decompression Model (Modified Haldanean) Loading bar graphs (Nitrogen,Oxygen, Ascent) Logbook: 24 Dives (3 screens each) History Mode: Total Dives, Max Depth, Total Dive Hours, Lowest Temp Display is based on the intuitive Wisdom3 format Safety and Deep Stop with countdown (Min:Sec) Selectable audible alarms with flashing icons Wet activation Data retention: Maintains settings and data during battery swap Available with and without Transmitter Optional: USB Cable Connector Sherwood Scuba adds the additional feature of Hoseless Air Integration with the introduction of the Amphos Air. The chrome accents give this stylish computer the flair needed to be used as a daily watch but still provides all the computing power you need when diving.