A connector housing includes an accommodation space defined by four walls and formed with an insertion port. The four walls include a first wall extending in a first plane and a second wall extending in a second plane perpendicular to the first plane, the first wall is connected with the second wall at a corner of the connector housing. A first positioning groove is disposed in an edge of the first wall proximate to the insertion port and a first positioning tooth is disposed on an edge of the second wall. The first positioning tooth extends in the first plane by vertically bending and engaging within the first positioning groove. The first positioning tooth and the first positioning groove have a first locking feature preventing the first positioning tooth from being disengaged from the first positioning groove in a direction perpendicular to the second plane.