Oceanic OC1 Complete Wireless Dive Watch Blue-With Free Online Training Class - W/o Buddy Check Powered by Oceanic's Exclusive Dual Algorithm(tm) - Your choice between Pelagic DSAT (Spencer/Powell data basis) or Pelagic Z+ (Buhlmann ZHL-16C data basis) Wireless Air Integrated with User Upgradeable Firmware Forged Titanium Body with 660 ft / 200 m depth rating Advanced Digital Compass with North, Reference, Auto Home, and Declination Adjustment Switch between 3 independent transmitters, with up to 3 nitrox mixes to 100% O2