The advances in electronics allowed the development of smart miniature devices called medical sensors, that can collect physiological data from the human body and its surrounding and send it wirelessly to healthcare providers in order to help avoiding life threatening events. This article presents a general overview on the types of medical sensors, their properties, and the wireless technologies used to convey collected data. Also, this article is the first to provide a summary about the wearable sensors’ brands available on the market, along with their interface and connection types [1, 2].