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    Portable Bluetooth Speaker concept, Jan. 2013
CARD SPEaAKER is an ultra-thin product, and thus can be put in your wallet. Though existing speakers for using outdoors have to be kept in bags owing to its size and volume, CARD SPEAKER can be moved without carrying bags. This product can be kept in your wallet usually, and you are able to enjoy pleasant music life by taking out it from your wallet like credit cards indebting to FFL(flat, flexible loudspeaker) and TFB(Thin film battery) technology.