A digital image is divided into segments, wherein the digital image comprises an array of pixels each having a pixel location and a pixel color value. The capacitive transducer consists of a plurality of cells with each cell comprising a first electrode and a vibration film on a first surface side of a substrate having a through wiring that penetrates the substrate from a first surface to a second surface of the substrate, the vibration film including a second electrode that is formed with a gap from the first electrode. The assembly is pivotable between a retracted configuration in which the three component parts lie in parallel planes, and a deployed configuration in which the two solar panels lie in one plane and the batteryswitch unit lies in another plane angularly intersecting the solar panel plane.