Set the USB to RS 232 serial port line used by the console port of router switch (passed the test by MS HyperTerminal, SecureCRT and other configuration software) It can solve the problem of notebook and desktop without 9-pin RS 232 serial port. It is mainly used to configure and use the console port of router, switch and other industrial control equipment. (this ordinary machine can be used, but large machines can't be used) It can also be used in barcode reading equipment, telephone, mobile phone, digital camera, modem, ISDN and other terminal adapter communication. It is characterized by good compatibility (other low-grade products on the market have incompatibility problems among various devices, so it is difficult or even impossible to use them after buying them back. It takes time and energy and costs more money. You will know once you have experienced it), Supports Windows 98, windows me, Windows 2000, Windows XP, MacOS 8.6 or higher. CD with drive It supports usb1.0 / 1.1 specification and is compatible with USB2.0 size: 0.6m Material:plastic colour:Blue Package Contents: 4 x Data Cable 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.