The Sony UWP-D Wireless package has been around for a few years now, and is a replacement for Sony's older mid-tier UWP radio mic package. It has most of the same features of the older system (including backward compatibility with that system) but offers a new digital companding mode; more on that in a minute. Design The first thing you notice about this new system is the design and build quality. Sony have redesigned the packs, to be more in line with your typical radio mic