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Tiêu chuẩn ISO ở đây [link]http://en.wikipedia.org/wiki/ISO_7736[/link]IT IS THE MEASURMENT OF THE WHERE THE RADIO FITS IN THE DASH , DOUBLE DIN IS A LARGE HOLE TWICE THESIZE OF A STANDARD RADIO
International standard ISO 7736 defines a standard size for car audio head units. The standard was originally established by the German standards body Deutsches Institut für Normung, and is therefore commonly referred to as the "DIN car radio size". It was adopted as an international standard in 1984.
Head units generally come in either single DIN (180 x 50 mm panel) or double DIN (180 x 100 mm panel) size. The depth is not standard.