The sensitivity can be steplessly adjusted in accordance with the requirements. The detection of small metal objects can be suppressed to a certain extent. The MAILEX 10 can be operated in a static mode or in a dynamic alarm mode. In the dynamic mode the frequency of the alarm and the brightness of the LED will increase if a metal object s in the vinicity of the sensor. This facility permits the position of the object to be clearly located. The detector auto-resets after each alarm. In the static mode the metal detection audio alarm remains at a constant level and the LED flashes.