an electrical connector for electrically connecting with a complementary connector includes an insulative housing defining a number of contact - receiving passages , and a number of conductive contacts respectively received in the contact - receiving passages adapted for electrically connecting with conductive contacts of the complementary connector and generating heat . the insulative housing defines a pair of first heat - radiating channels located at opposite lateral sides thereof and extending through the insulative housing along a mating direction , and at least one second heat - radiating channel extending through the insualtive housing along the mating direction and located between at least a pair of contact - receiving passages adjacent thereto . the heat generated by the conductive contacts is capable of radiated out of the insualtive housing through the first heat - radiating channels and the at least one second heat - radiating channel .