Network Cable Pair Connector Extender Adapter

This is essentially an RJ45 coupler.  

Key features:

• RJ45 connectors: Standard Ethernet connectors.  
• Gigabit speed: Supports high-speed network connections.  
• Straight-through: The cable orientation is the same on both ends.
• Dual pass: Allows data to pass through both ends simultaneously.
• Crystal head: Refers to the type of connector used.

In essence, it's a simple tool to extend your network cable without replacing it entirely.