  We present an heuristic argument for the universal area product:
A_{+}A_{-}=(8\pi J)^{2}+(4\pi Q^{2})^{2} for a four-dimensional, stationary,
axisymmetric, electrically charged black hole with an arbitrary stationary
axisymmetric distribution of external matter (possibly charged), derived by
Marcus Ansorg and Jorg Hennig. Here A_{+} and A_{-} are the areas of the event
and Cauchy horizons, and J and Q are the angular momentum and electric charge.
Based on this argument, we conjecture that a universal area product holds for
higher-dimensional, stationary, multi-horizon black objects in the presence of
an external stationary charged distribution of matter.
