HDMI Balun transmitter and receiver
Send your HDMI signal over Cat5. The HDMI Balun converts any HDMI signal into a Cat5 cable, and then converts back to HDMI at the TV End. This is useful when your laptop (or other source) is located more than 10m away from the TV display.
If you wish to have your Laptop setup further than 10-15 meters from the TV, it is best to use an HDMI Balun. This allows you to send the HDMI signal up to 50 meters without loss of quality.