The upgrade for the product is the Gefen EXT-CAT5-7500.
The Gefen EXT-CAT5-6000 extends two
monitors, USB, Serial (RS232) and Audio with 3x CAT5 cables up to 330 feet away
from your computers.

Gefen EXT-CAT5-6000 Receiver & Sender Backside
How the Gefen EXT-CAT5-6000 works:
The EXT-CAT5-6000 sender unit sits next to your computer. Cables supplied
with the EXT-CAT5-6000 connect your CPU to the sender. The
EXT-CAT5-6000
receiver unit sits next to the monitors, keyboard and mouse - up to 330 feet
away. Two monitors, keyboard and mouse plug into the back of the receiver.
CAT-5 extension cables up to 330 feet connect the sender and the receiver to
each other.

Gefen EXT-CAT5-6000 Diagram
Gefen EXT-CAT5-6000 Features:
- Extends two monitors, USB and audio using category 5 cables
- Extends RS232 using category 5 cable
- Saves money on cable and hardware costs
- Saves space on your desktop
- Convenient, flexible and expandable
- Eliminates computer noise where you work
- Maintains 1920 x 1200 x 75 resolution video
- Support any type of CRT or LCD analog monitor
- USB supports high powered 4 port HUB
- Ideal For Mac or PC computers using USB or RS232 peripherals
- Extends audio for multimedia applications
- Rack mountable
Gefen EXT-CAT5-6000 Package Includes:
- EXT-CAT5-6000S Sender
- EXT-CAT5-6000R Receiver
- Two 6ft VGA cable
- One 6ft USB cable
- One 6ft Audio cable
- Two 5V Transformers
- Rack Ears