This unique model draws inspiration from Mars: its bezel has a reddish-copper tone, paired with a rich brown resin band. It’s part of the “Mars & Venus” pairing series, visually matching a counterpart design (MSG‑B100MV‑5A) in the G‑STEEL / G‑MS line

Shock-resistant & Water Resistance: Built with Carbon Core Guard structure; water‑resistant up to 200 m

Solar Power (Tough Solar): Powered by light with around 7 months of use on full charge—or up to 18 months in power‑save mode

Smartphone Connectivity: Bluetooth-linked via Casio app for automatic time sync, world time for 38 cities, phone finder, reminders, and time/place logging

Display: Analog hour/minute hands plus a small dial providing battery/mode info; negative (inverted) LCD screen. Features hand-shift to move analog hands aside for digital viewing

Functions: 1/100‑sec stopwatch, countdown timer, 5 daily alarms, full auto-calendar (until 2099), world time, Neobrite luminous coating, and Super Illuminator double‑LED light

G-STEEL GST-B400-a Series GST-B400MV-5AA