The sensor has been made using advanced nanomaterial. What the researchers did was that they used the silver nanotubes which can effectively monitor your body reading, and made a specific pattern out of it with stencil, so that it fits your body perfectly. Then the nanotubes were covered with a special liquid polymer, which after setting down forms the outer membrane layer of the sensor. This polymer membrane is also the antenna part of the biometric sensor, which transmits the signals to the receptor.