Both smart and good looking the Citizen Proximity features perpetual calendar chronograph with second time zone 12/24 hour time power reserve and sporty leather strap with a nylon backing. This timepiece is Bluetooth 4.0 compatible and just like the watch this low energy Bluetooth is powered by Eco-Drive technology. Through the Bluetooth 4.0 connection with your iPhone® you can be alerted to incoming calls emails messages reminders and alerts. The free of charge Proximity App is available from the Apple® App Store on your compatible iPhone® or from iTunes on your computer. Click here to go to the iTunes preview web page for the Proximity App.