●Description This is the basic application for connecting and communicating with a Bluetooth(R) v4.0 enabled G-SHOCK. Pairing the watch with your smartphone enables use of a variety of different Mobile Link functions that greatly enhance the smartphone experience. The GBA-400+ app also simplifies certain watch operations by letting you perform them on your phone screen. Visit the website below for details. http://world.g-shock.com/ We recommend using GBA-400+ on the following operating systems