The Doxa SUB 300 Carbon Professional, reference 822.70.351.21, is a diving watch featuring a 42.5 mm forged carbon case with a pressure-resistant titanium inner casing. It is powered by an automatic movement, offering a 38-hour power reserve and COSC-certified chronometer precision. The watch includes a unidirectional rotating bezel with a dual scale for depth and dive time calculations, and a date display at 3 o'clock. The orange dial is protected by a domed sapphire crystal with anti-reflective treatment, and the hands and indices are coated with Super-LumiNova for enhanced legibility. Water-resistant up to 300 meters, it comes with an orange rubber strap and a black PVD-coated folding clasp.