A local router for a home network pairs with a mobile device via a local network connection. The lens has an opening formed on an upper side for engaging with an engaging portion on an upper side of a frame with a soft protective pad and has a protrusion extending upwardly from a middle section of a lower side to be inserted into a hole adjacent to a concave section formed on a lower side of the frame. A, B, C, D, E, and F are selected from a variety of elements and groups, including but not necessarily limited to O, S, Se, Te, N\u2014Rc, C, W1, and W2 . The first and second semiconductor die structures are stacked together with at least one of the metal regions on the backside of the first semiconductor die structure in direct contact with at least one of the metal regions on the back side of the second semiconductor die structure.