Description: 1. Serial port hole through the hole: 1-1 2-2 3-3 4-4 5-5 6-6 7-7 8-8 9-9 2. Female to Female 3. Polyethylene HDPE insulation, anti-interference, transmission signal attenuation less, the use of good results. 4. Uses the UL standard design, applies the connection between the computer and the serial port equipment and transmits the signal between them Package Included 1 X Female to Female DB9 Expention Cable.