Men's Black Fully Automatic Mechanical 43mm Hollow Skeleton Dial Wrist Watch

Automatic Mechanical Movement No Battery Required: Powered entirely by a self-winding automatic movement that harnesses the motion of your wrist to keep running. The mechanical caliber features 21 jewels, beats at 21,600 vibrations per hour, with no battery needed and precise timekeeping that honors traditional watchmaking craftsmanship  43mm Open-Heart Dial with Luminous Stick Markers: The 43mm round dial makes a bold statement on the wrist. An open-heart skeleton window at 6 o'clock reveals the oscillating balance wheel inside. Applied luminous stick hour markers and hands absorb light during the day and glow clearly in the dark for effortless night reading  Full Calendar Display with Year & Month at 12 O'clock: Beneath the RUIGE logo at the 12 o'clock position sits a dedicated perpetual calendar display: the left window shows the year, the right window shows the month. The left sub-dial tracks the day of the week, and the right sub-dial tracks the date. Everything you need to stay organized, laid out cleanly on one well-planned dial  3ATM Daily Water Resistance: Rated 3ATM (30 meters) water resistant, this watch withstands everyday splashes, hand washing, and brief exposure to rain. Designed for daily wear, it keeps running reliably through normal routines without worry