This is Casio’s first G-Shock with built-in Bluetooth and it works with an iPhone 4S/5 (iOS 5.1 and above) to notify you about incoming calls, email, Facebook and Twitter updates. It also syncs time with the phone, works within a range of 2 meters and has a phone finder function that helps in locating your phone using an alarm. It disconnects from the phone to save power and a tilt sensor detects movement to automatically reconnect if you touch it. The watch is shock resistant and offers water resistance of up to 200 meters. Battery life is a claimed two years and has all the usual features of the GShock series that includes world time and LED backlight.

This model isn’t available yet but you can pick the Japanese limited edition on Amazon