The Doxa SUB 300β Professional, reference 830.10.351.20, features a 42.5 mm stainless steel case with a slim profile of 11.95 mm. It is equipped with a black ceramic unidirectional rotating bezel and a screw-down crown, ensuring water resistance up to 300 meters. The black sunburst dial includes a date display and is protected by a scratch-resistant sapphire crystal. Powered by a Swiss automatic movement with a 38-hour power reserve, the watch comes with a black FKM rubber strap secured by a folding clasp with a ratcheting wetsuit extension. Additional features include a helium release valve for diving safety.