This Casio G Shock Black and Purple Watch GBA900 1A6 features a 51mm case and a whole series of features in this digital watch, all encompassed in a stylish black and purple finish. Introducing the latest G SQUAD additions to the GBA 900 Series of Smartphone Link timepieces. This model can measure distance using an accelerometer while linked with the GPS function of a smartphone via Bluetooth . Once you take measurements with a smartphone, the next time you will be able to measure distance with the watch alone.This G Shock features a backlight, shock resistance, mineral glass, 200 metre water resistance, training function, and more.