G SHOCK-G-STEEL GST-B400 Series GSTB400-1A 43 mm framed by a polished-brushed green

framed by a polished-brushed green ceramic bezel

Automatic mechanical movements have an oscillating weight that winds the spring with the motion of the wearer’s arm

Using activity functions (GPS

Stainless steel bracelet with black hard coating

G SHOCK-G-STEEL GST-B400 Series GSTB400-1A 43 mm framed by a polished-brushed greenCase and bezel material Resin Stainless steel Band Resin Band Construction Shock Resistant Carbon Core Guard structure Water resistance 200 meter water resistance Power supply and battery life Tough Solar (Solar powered) Smartphone Link App Connectivity Features Smartphone Link feature Mobile link (Wireless linking using Bluetooth) Apps CASIO WATCHES App connectivity feature Auto time adjustment Easy watch setting Approximately 300 world time cities