HE04SEK is an HDMI distribution extender that can use CAT5e cables to not only extend one HDMI but also split it into 4 HDMI signal for remote displays. Its RX units don't require external power supplies. and have built-in HDMI connectors that allow the RX to directly connect to HDMI devices. TX is an expandable unit that can stack another TX to get 1 HDMI input and up to 12 HDMI outputs and can display one HDMI video at different HDMI displays at the same time. It's a perfect solution for sports bar, churches, conference rooms, classrooms, and security rooms...etc.