Hammond 1551USB Series Miniature Plastic USB Enclosures – Hammond 1551USB2TRD, The Hammond 1551USB2TRD is a 50 x 25 x 15.5mm USB enclosure moulded in UL94-HB rated transparent red ABS. It is ideally suited for housing a dongle or mounting a small printed circuit board that incorporates a USB connector. Hammond 1551USB2TRD Miniature Plastic USB Enclosure 50x25x15.5 Transparent Red