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Credit Card Radios RD-10
Card radios, like the Casio RD-10, are basically compact, portable radio receivers designed to be roughly the size of a credit card or a small stack of cards, making them highly convenient for on-the-go use. These devices emerged during a time when miniaturization was a big trend in consumer electronics, particularly in the 1980s and 1990s, as companies pushed the boundaries of making gadgets smaller as well as more portable.