Aesthetically, TravelCard is a small rectangular box with a three-toned design and a slide-out Lightning plug as its most noteworthy design features. The tapered aluminum front alternates between glossy and dot-matte finishes that make the black, silver, red, or blue metal look fancier, while the all-plastic back is either white or black depending on the base color you select. Our green review unit isn’t currently offered as a color, but appears…