1. A portable device comprising: a housing comprising opposing first and second sides separated by an interior portion; an input pad disposed on the first side of the housing, wherein the input pad comprises an electrically conductive material and wherein the input pad is configured to accept a touch input; a plurality of output pads disposed on the second side of the housing, wherein the plurality of output pads comprise an electrically conductive material and wherein the plurality of output pads are configured to electrically interact with one or more capacitive sensor elements of a touch sensor associated with a different device external to the housing; an insulator disposed within the interior portion, wherein the insulator is configured to separate the input pad from the plurality of output pads; and an interconnect matrix having one or more electrically conductive elements disposed within the interior portion, wherein the one or more electrically conductive elements couple the input pad and a subset of the plurality of output pads such that only the subset of the plurality of output pads are detected by the one or more capacitive sensor elements of the touch sensor associated with the different device when the second side of the housing is proximate to the one or more capacitive sensor elements with the plurality of output pads facing the one or more capacitive sensor elements, the interconnect matrix transforming a coordinate associated with an effect at the input pad to coordinates of the subset of the plurality of output pads, the coordinate associated with the effect at the input pad being different than the coordinates of the subset of the plurality of output pads.