Mounting Standard refers to the way the device is installed in the vehicle.
\r\nThe DIN system uses a standardized rectangular opening in the dash. DIN installations are usually quick and easy. Removal and installation is done from the front, and in most cases, you don't have to remove any dash pieces.
\r\nMost modern cars use the 'ISO standard' connector block system for connecting up the factory-fit radio. This consists of twin eight-pin rectangular plugs (two rows of four pins each), one plug for the power and one for the speaker connections.
\r\nCommon among Japanese vehicles is the cross ISO-DIN mount. An advantage of this type of mounting is that you can install a DIN receiver and use the car's factory-installed radio brackets for support. To install a DIN-style receiver in an ISO-DIN style opening, you'll probably need to remove the new receiver's plastic trim ring. The car owner's manual will let you know if this is the case.