The invention relates to the assembly of devices, produced by replication on a substrate and separated from each other by a cutting process. The wood product comprises aligned, substantially straight wood strands cut from veneer, disposed side by side lengthwise in substantially parallel relationship with adhesive bonding together the strands. According to a constant detecting current generated by the first digital-to-analog converter, or the first bias voltage generator, the first video output terminal has a detecting voltage for indicating whether the video output system is connected with the display device. A control assembly is positioned in the interior space of the housing.