Casio Men's EDIFICE Nighttime Drive Series Watch ECB-40YNP-1AJFProduct Highlights The ECB 2000YNP features a gradient from deep blue at the top to gold at the bottom, while the ECB 40YNP showcases a gradient from deep blue to silver. This design captures the night sky above a highway, embodying Speed & Intelligence under the night sky. The ECB 2000YNP comes with smartphone link and Tough Solar, while the ECB 40YNP features smartphone link. Connect to smartphone apps via Bluetooth for features like automatic time