The CAT5 9000 sender sits next to your computer. Cables supplied with the CAT5 9000 connect your CPU to the sender. The CAT5 9000 receiver sits next to the monitors, keyboard/mouse, RS232 and audio devices - up to 330 feet away. Monitors, keyboard, mouse, audio and RS232 can be plugged into the back of the receiver. Three CAT-5 extension cables connect the sender and the receiver units to each other.