The GST-B400CX-1AJR features a diamond pattern on the watch face, band and buttons, mimicking snake skin. Plus, the “eternal snake” motif, resembling the infinity symbol, is shown on the packaging. This GST-B400 model is a smartwatch, with Bluetooth connectivity allowing you to pair the device with your phone. Here, you can download the Casio Watches app to access features like reminders, phone finder and automatic time adjustment. The wearable also offers world time across 38 cities, a 1/100-second stopwatch, a battery level indicator and a double LED backlight.