US Patent 11791580 Plug connector and connector assembly

A plug connector for mating with a receptacle connector which is provided with a groove at an upper surface thereof includes: an insulating body; and a locking elastic piece on the insulating body, wherein the insulating body includes a main body and a mating portion extending forward from the main body, a bottom of the mating portion protrudes downward to form a sinking portion, and the sinking portion is located entirely above the groove.