SEAC® ACTION HR is the new wrist-mount diving computer for scuba and freediving. Easy to use, with 3 main modes: SCUBA MODE: full management of recreational dive profiles with a Bühlmann 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, current/maximum depth. LOGBOOK MEMORY: SCUBA mode: 40 hours with records every 5”. FREEDIVING mode: 18 hours of activity with records every 2”. SAFETY WARNING: MOD exceeded alarm, deco stop violated alarm, ascent speed alarm, NoFly time and desaturation calculations, maximum permitted altitude warning. “NDL only” Dive Planner. Dive Manager software for MAC/PC (requires Windows 10), available free of charge at seacsub.com. Download data via USB cable (optional accessory). Ultra-durable structure treated for improved resistance to blows, corrosion, and swings in temperature. LCD screen with contrast and adjustable-intensity backlighting. Long-lasting CR2450 battery. Crown, buttons, and buckle with HR treatment.