A standard humanitarian demining Earset (Earset Speaker On)
permits the detector’s internal speaker to continue to function even
when the Earset is connected.
For military countermine applications, an Earset that mutes the F3Ci’s
internal speaker when the Earset is connected is available (Earset
Speaker Off). The Earset Speaker Off is identified by a short length of
green tubing located at the rear of the Earset Plug.
* WARNING *
Minelab strongly recommends that an operator always wears an
Earset when using the F3Ci detector.