The current "portable" audio products mainly include portable signal sources (CD/MP3) and portable speakers. In addition, many portable speakers have both USB\SD playback functions and carry out "portability" to the end; while portable audio sources are matched with headphones The system appeared earlier, from the earliest cassette-type walkman products to later portable CD and MP3 players. With the development of technology, the functionality of "portable" audio products is gradually increasing, and the volume is getting smaller and smaller. Although the sound quality is limited by the volume, the sound quality of today's portable speakers is better than before.
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