The Seac Action is a wrist dive computer designed for scuba diving and freediving, featuring a durable black housing and USB connection. This multifunctional device operates in three modes: Scuba Diving Mode, Depth Gauge Mode, and Freediving Mode for comprehensive underwater monitoring. The Scuba Diving Mode utilizes the Bühlmann ZHL-16C decompression algorithm, supporting one or two gas mixtures, including air, nitrox, and oxygen-rich mixtures up to 99 percent O2. It offers complete dive profile management with 40 hours of detailed logging in 5-second intervals, including no-fly time calculations, desaturation time tracking, and altitude warnings. Safety features include maximum operating depth alarms, decompression stop warnings, and ascent rate monitoring. The Depth Gauge Mode operates independently with depth measurement and stopwatch for separate dive profile management. The Freediving Mode tracks dive and surface times as well as current and maximum depth measurements, storing 18 hours of activity data in 2-second intervals. The device features a high-contrast LCD display with adjustable backlighting for optimal visibility under various underwater conditions, powered by a long-lasting CR2450 battery. Seac Action includes dive planning functionality with no-decompression limit calculations and comprehensive safety alarms. The device connects to the Seac Dive Manager software for Mac and PC systems, allowing detailed dive log analysis and data management via the included USB cable. This dive computer emphasizes reliability and precision in underwater monitoring with enhanced resistance to environmental factors, suitable for recreational divers seeking comprehensive dive data management without unnecessary complexity.