A light reflection and diffraction element for enhancing the contrast of an image display device. A registration protocol may be used by the monitoring module and the remote site in generating the messages communicated during the registration process. Furthermore, the method includes verifying an availability of funds to pay the defined payment amount and authorizing payment of the defined payment amount if funds are available to pay the defined payment amount. The flaps translate acceleration in a predefined direction to strain in the strain sensor. The positioning member of the adjustment member is selectively matched with one or more of the receptacle members for adjusting a pitch of the blades.