A connector assembly comprises a first connector and a second connector, with a printed circuit board located therebetween. The first connector comprises a first mating housing and a socket integrally connected to the first mating housing. The second connector comprises a second mating housing, a first board lock and a second board lock integrally connected to the second mating housing. The printed circuit board defines a first hole, a second hole and a third hole in such locations respectively corresponding to the locations of the second mating housing, the second board lock, and the first board lock. The second connector is fixed to the printed circuit board and the first connector by engaging the first board lock with the third hole of the printed circuit board, rendering the second mating housing of the second connector to be engaged with the first mating housing of the first connector, rendering the second board lock to extend through the second hole and finally to be retained in the socket of the first connector.