A therapy system for applying an electrical signal to an internal
anatomical feature of a patient includes an implantable component and an
external component. The external component can be configured into one of
multiple selectable operating modes. The therapy system also may include
a first external antenna configured to communicate with the implantable
component and a second external antenna configured to communicate with
the implantable component. Plugging one of the external antennas into the
external component automatically configures the external component into
one of the operating modes.