Action 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 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. Features: 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, maximumpermitted 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. Available in version with crown, buttons, and buckle in stainless steel (ACTION) or with HR treatment (ACTION HR). Long-lasting CR2450 battery, easy to buy LCD screen with contrast and adjustable-intensity backlighting, for high visibility Ultra-durable structure treated for improved resistance to blows, corrosion, and swings in temperature