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【Applicable】 H4 conversion to Ba20d/ T19 or other bulb headlights for wiring connecting.The length of the cable harness is 16 cm (including the socket). 【Easy Install】3 Pins LED bulb socket connector, plug-in bulb expansion, good expansion or replacement. Can be used to create additional sockets for easy installation, without the help of any mechanic. 【High quality】100% fit for H4 original socket, also suitable for replacing the corroded or melted wiring of the headlights. 【Durable】The high temperature resistance material shell ensures good heat resistance and long life. Install on OEM/LED/SMD bulb socket to achieve maximum power output. 【Note】Please ensure that the positive and negative poles are connected correctly,if there is any questions of the installation, welcome to come to us.