Gender Changer 9(female) to 9 (female) Instructions: 1. DB9 Mini female to female adapter 2. Metal shield housing; Antioxidant nickel plating: metal shield shell design, stable and sturdy structure, shielding against interference; Nickel plated on the surface, not easy to rust. 3. Pure copper ferrule of blue plastic jack: effectively improves the oxidation resistance of the interface, improves data transmission performance, and achieves stable signal transmission.