I was picking through one of my boxes that's been in storage forever and found these little gems. The Realistic CD-3100 is one of my favorites with flat buttons and the brushed metal cover. The unit is pretty heavy and looks contemporary in design with a 1987 production date. The black plastic holder is removable and holds the batteries for portable playing. The Sony D-5 CD Player needs no introduction, an early 1985 unit this one has no accessories. Without a scale, I'd say the Realistic is just a tad heavier.