A connector is provided. The connector includes a connector body, a signal transmitting unit, a cover, a fastening plate, and an extension plate. The connector body has side walls to enclose an assembly hole. The signal transmitting unit is disposed in the assembly hole. The cover has a first end, a second end, and a first pivot and is disposed outside the assembly hole. The first end and the first pivot are disposed on two ends of a side case of the cover. The second end is opposite to the first end while the first pivot is axially connected to one side of the assembly hole. The fastening plate has a second pivot opposite and parallel to the first pivot. The second pivot axially connected to the side wall around the assembly hole. One end of the extension plate has a third pivot parallel to the first pivot and is rotatably connected to the fastening plate. The other end of the extension plate has a pressing portion to press the second end of the cover from outside to make the cover rotates toward the connector body and press the signal transmitting unit.