This is the smart watch that uses one set of batteries for an entire year. The watch connects to an iPhone or Android-powered phone via Bluetooth Smart technology that uses a fraction of the energy required by older versions of Bluetooth, allowing the batteries to last up to one year and eliminating tedius recharging. When someone calls the connect phone the watch automatically displays the caller ID and different icons appear to notify you of an incoming text, email, or social media activity. Missed calls, calendar notifications, and low phone battery alerts are also displayed on the watch and buttons on the side of the bezel allow you to play or pause music playing on the phone or take a picture. The watch has a brushed stainless-steel bezel, scratch-resistant mineral glass, and a rubber strap. Water resistant. Face: 1 3/4" Diam. x 2/3" D.