It is used on standard OBD2 DLC for scantool such as ELM327 bluetooth as an extension adaptor. 1x Male 16 pin J-1962 to 2x Female 16 pin J-1962. 1 x16 PinMale to dual Female Cable. It can extend the life of the car DLC and ELM327 bluetooth if user needs to plug and unplug frequently.
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