The G-SHOCK MT-G MTGB4000B-1A Bluetooth combines resin and metal in a bold black design with red accents, delivering a tough yet refined modern look. It uses an AI-assisted Dual Core Guard structure and a carbon–stainless steel hybrid frame for high strength with a lightweight feel, finished with a layered carbon bezel, sapphire crystal, and precision detailing from Casio. It features TRIPLE G RESIST protection (shock, centrifugal force, vibration), Tough Solar charging, and Bluetooth® Mobile Link for automatic time syncing. Multi-band radio control supports accurate time updates across Japan, USA, UK, Germany, and China. Functions include world time (38 zones / 27 cities), UTC display, DST auto switching, stopwatch, countdown timer, daily alarm, Super Illuminator LED light, automatic hand correction, full auto-calendar to 2099, and day/date display. Size is 56.6 × 45.3 × 14.4 mm with a weight of 112 g. Battery life is approx. 5 months normal use or up to 18 months in power-saving mode, with ±15 seconds per month accuracy without calibration or Bluetooth. - Module No. 5743 - 56.6 x 45.3 x 14.4mm Case Size - 112g Weight - Triple G Resist (shock, centrifugal force & vibration resistant) - Tough Solar (solar powered) - Super Illuminator LED light with afterglow - Multi-band time calibration (Japan, USA, UK, Germany, China) with auto/manual reception - Bluetooth® Mobile Link - Automatic hand position correction - World time: 38 time zones (27 cities), UTC display, DST auto switching, home city swap - 1-second stopwatch (up to 23:59’59”) - 24-hour countdown timer (1 sec units, 1 min–24 hr range) - Daily alarm - Battery level indicator - Power Saving mode - Full auto-calendar to 2099 - Day & date display - Analog display: 3 hands + 3 sub-dials (dual time, 24h, day) - Accuracy: ±15 sec/month (without calibration/Bluetooth) - Battery life: approx. 5 months normal use / 18 months power saving mode