A substantially transparent windscreen head-up display of a vehicle is configured to display graphical images from a light source. In response to the command, a request is transmitted to a remote server from the first mobile phone over a cellular network requesting an operating status of the second mobile phone. The multi-tone packet has a plurality of tones with each tone having a different power level, and at a different frequency, from other tones in the plurality of tones. The temporary spacer and dielectric separation layers are then anisotropically etched, forming a dielectric \u201cboot shape\u201d on a lower edge of the dielectric separation layer. The core-containing structure particles comprise first core-containing structure particles of which shells contain the binding metal and second core-containing structure particles of which cores and shells both contain the binding metal.