An apparatus for enabling legacy communication devices to engage in conversations in either a near real-time or a time-shifted mode. In a normal state, a discharge current of the battery cell flows through the thermostat of the current control device. Suitable endosome pH-raising agents include lysosomotrophic amines, proton ionophores, and vacuolar H ATPase inhibitors. The card holder is mounted over a card having two legs such that the card first leg is adjacent to the card holder first leg and the card second leg is adjacent to the card holder second leg.