A conductive composition, a polymer obtained from the conductive composition, a method of preparing the composition, an electrode and electrolyte membrane of a fuel cell, each including at least one of the composition and the polymer, and a fuel cell including at least one of the composition and the polymer. The voltage regulator includes a voltage regulation circuit responsive to a reference voltage at the input port to provide a regulated voltage at the output port, including a compensation capacitor having a plate connected to a node internal to the voltage regulator, and including a current source coupled between the voltage supply and the internal node. An upper part retains the attaching means. The first strap member defines a loop between the first and second intersections that is sized and configured to cross the chest of an animal. Once a product registers with a token service, it can participate in SSO. The unit detects the generation of upstream light during intervals in which transmission is not authorized.