Smart watch is the first wearable device that was rolled out. This year, clobal sales of smart watches are expected to reach 7 million units. After Samsung's Galaxy Gear, Apple's iWatch is also drawing attention ahead of its launch. Most of the rolled out smart watches are connected to smartphones, playing the role of assisting smartphone usage. Through the small screen attached to the wrist, users can send text messages, use SNS, get incoming calls, play music or take pictures with the smartphone camera. Aside from these, what other functions do the smart watches have? We will meet the smart watches that will open the age of next generation wearable devices.