With increasing interests in wearable devices, the first Wearable Device Technology Expo 2015 was held on January 14, 2015 at the Tokyo Big Sight including the participating companies of the batteries and electric parts/materials such as a sensor, display, etc. which are to be used for wearable devices. The host announced that the event in 2016 will be about four times larger than this year proving the increased interests in associated industries and expected a drastic growth of the wearable device industry.