High quality and durability: pure copper electroplating joint, fine welding joint, plug resistance, good contact, high quality, durability and . The shell is made of environment-friendly PP engineering material, soft and durable. Easy to use: no welding, 128 environment-friendly copper terminal design, no soldering iron and heavy tools, simple wiring. The shell is designed with folding buckle, which can be assembled and disassembled without tools. High compatibility: It can connect serial devices. Such as computer and tax control computer, digital camera, PLC, PDA, MODEM, set-top box, barcode machine, industrial instrument and other communication equipment. Humanization: Each products is equipped with a cable pressing plate to prevent the connected wires from falling off ; The shell adopts anti- design. Intuitive: all signal ports have clear names, and labels are pasted on both sides of the board for quick wiring. Colour:black Material:plastic Package Contents: 4 x db9 connector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.