The term "wearable computing" or "wearable technology" refers to a new approach to computing, redefining human-machine interaction, where gadgets are directly connected with the user, in general terms, the user would be "wearing his gadget". Wearable devices are intended to make the user as "passive" as possible, focusing on the human being and his needs. Wearable computing is often related to the Internet of Things. The 'wearable' computing market is expected to reach $ 19 billion in 2018.