An aspect of the invention provides a security device including an array of printed lenses arranged on a first surface of a substrate and a microimage array underlying the array of printed lenses, whereby a synthetic image of portions of the microimages is generated by the lenses. A first control unit is configured to determine a work phase of the work implement and to set an upper limit for the throttle opening degree in accordance with the work phase. A cascaded S-parameter matrix for the matching network in combination with the device is calculated, and from the resulting cascaded S-parameter matrix, a mixed-mode cascaded S-parameters may be extracted. The LED and the heat sink are attached to the first circuit board via solder. The elongated bore extends between the post-receiving opening and a threaded aperture.