Seac Action HR Dive ComputerAction HR Dive Computer Seac ACTION and Seac ACTION HR are new wrist mount diving computers for scuba and freediving. Easy to use, with 3 main modes: SCUBA MODE: full management of recreational dive profiles with a Bhlmann ZHL 16C decompression algorithm for 1 or 2 mixes(air, Nitrox, and mixes with O2 concentrations up to 99%). GAUGE MODE: Depth gauge and stopwatch for managing your dive profiles independently. FREEDIVING MODE: Dive surface time,