An adhesive composition comprising at least one tackifier resin and at least one acrylic polymer is provided wherein the tackifier resin comprises monomer repeating units from at least one aromatic monomer and at least one acrylate monomer; and wherein the tackifier resin has a low residual monomer concentration. The substrate layer is at least partially formed from a material having a first degree of stretchability. Another embodiment includes a unique combination of the device with the belt clip. Such native oxides function as undesirable insulators degrading current emission. The DTK modules include an application separate from the predetermined IVR application.