This product is a tool designed to be applied to 10BASET and 100BASETX networks. The monitoring ports are J3 and J4, which are only used to receive data. The method of use is as follows:Connect the Ethernet cable to be tested to J1 and J2 of Throwing Star LAN Tap, that is, J1J2 gets data.Connect the Ethernet cable to J3 or J4 of Throwing Star LAN Tap, and each port only detects one aspect of data communication.Use software such as TCPDUMP or WIRESHARK to capture network communication data on the workstation.Throwing Star LAN Tap is an Ethernet intranet data analysis device.Color: Black & SilverMaterial: PCBPackage Contents:1 * Throwing Star LAN TapOnly 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.