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2 Plug the voltage converter into the cigarette lighter jack (only for 12 V car battery, negative grounding), then connect the wired end with 4.5V DC input jack on the set. 3 If necessary, clean the cigarette lighter jack to obtain a good electrical contact. 4 Turn down the volume and connect the cassette adapter plug to LINE OUT/p on the set. 5 Carefully insert the cassette adapter into the car radio’s cassette compartment. 6 Make sure the cord does not hinder your driving. 7 Decease the volume