Movement: Powered by the Seiko Caliber 4R35, an automatic movement with manual winding capability, offering approximately 41 hours of power reserve. It includes a stop-seconds function for precise time setting. Case: The stainless steel case measures 43.8mm in diameter and 13.4mm in thickness, providing a robust and durable design suitable for diving. It features a black stainless steel unidirectional rotating bezel for tracking elapsed time underwater.