Wiktionary
dual mode
n. Either of two modes in which a device is designed to operate
Usage examples of "dual mode".
The United States also had eight of its Sea Control Carriers in the area, four of them the older Tarawa or Wasp class amphibious assault ships that were operating in a dual mode, and four of them the new Hampton Roads Class Sea ships which had been designed and built from the keel up for the sea control mission.