The Ubiquiti 1.25 Gigabit RJ45 Copper SFP Transceiver is a hot-swappable module that allows Ethernet connections over standard RJ45 cables through SFP slots. It supports speeds up to 1.25 Gbps and works with Cat5e or Cat6 cables for distances up to 100 meters. Compatible with Ubiquiti switches and devices, it's ideal for extending copper network connectivity.