When not in use, please protect the RJ45 female jack from dust and oxygen. Completely block any gaps and prevent dust more effectively. Little handle lets you easy to put on and take off.Anti-dust plugs made of ABS, soft and flexible material, easy to put on and take off.Environmental protection and no peculiar smell. Insulated and protected computer interface, to make it look like new for a long time. interface absorb moisture to prevent corrosion oxidation, leading to a short circuit. effectively reduce the static electronic products, to avoid a breakdown event. Plug it,Protect open ports or Identify dead ports;Prevent use;Show users where to connect. Designed to fit into all Ethernet Port RJ45. Colour: blue + black Material: ABS Package Contents: 100 * RJ45 Port Hub Anti Dust Cover 1 * Black proprietary lock and key Only the above package content, other products are not included. Note: Light 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.