The Bluetooth® v4.0 (Bluetooth® low energy technology) enabled G-SHOCK puts low-power near field communication technology at your fingertips throughout the day. Linking with a Bluetooth® v4.0 iPhone enables a host of useful features and functions, including incoming call and mail alerts on your G-SHOCK, Phone Finder, Link Loss Alert Alert, Auto Time Update and more. All of these functions and more are powered by a single button type battery with a battery life of approximately two years. And, of course, everything comes protected by world-renowned G-SHOCK shock resistance. This and more makes G-SHOCK smarter and tougher than ever!