An electro-optic device may include a substrate that supports a first and a second electrode, a functional structure including at least one functional layer that is electrically coupled to the electrodes, and an etched metal structure electrically coupled to at least one of the electrodes. The carrying structure includes a snap module received in the mounting hole, having a pressing element, a snap element, a knuckle element and an elastic element, and a strap. An electrically conductive material is disposed in the via over the first insulating layer to form a TSV. When the conference call ends, the subscriber’s phone is returned to normal service. The impurities can be added by different methods such as ion implantation, annealing and diffusion. The container is permeable to water and to calcium ions but retains the modifying agent.