This invention is based upon the unexpected discovery that the reactivity of the most important monomers commonly used in synthesizing tackifier resins with aluminum halide catalysts can be enhanced by conducting the polymerization in the presence of an allylic halide. The hydrogel polymers may deliver therapeutic entities by controlled release at the site. The leads can be coupled to interior surfaces of the electronic device housing to hide the sensor from view, such that electrical signals generated by the user can be transmitted from the user’s skin through the electronic device housing to the leads. It is also possible to separately optimize adjustments to a voltage of recovered data and a recovered supply voltage. The two different configurations of carousels are interchangeable on the same dose ring.