Casio G-Shock GWM530A-1.  This digital sports watch is part of the G-Shock series known for its durability and advanced timekeeping features. Key specifications for this model include: Tough Solar Power: The watch is powered by light, which recharges a built-in battery for long-term use. Multi-Band Atomic Timekeeping: It automatically synchronizes with radio signals in several regions (including the US and China) to ensure precise time and date accuracy. Durability: Features a shock-resistant design and 200M water resistance, making it suitable for sports and professional marine activity. Core Functions: Includes a 1/100 second stopwatch, countdown timer, four daily alarms, and a full auto-calendar.  Other highly similar models include the GW-530A and the GWM500A-1, which share the same rugged aesthetic and solar-atomic functionality.