This is the Casio G Shock G Lide Grey Watch GLX S5600 1DR. These new smaller, thinner G LIDE sports line models feature a useful Tide Graph function. Environmentally friendly biomass plastic made from renewable organic resources is used for the bezel and band. In terms of functionality, these models come with Tide Graph and Moon Data, essential functions that support surfing the world's oceans. These fashionable and sporty models are available in nostalgic colors popular on the surf scene.