The SB-2809 is an S-Video or Composite Video and Stereo Audio Amplifier (booster) used to drive signals over a long distance. This product provides signal amplifier from +0db to +6db via an adjustable control. This is useful for distributing signals from any video source, included higher resolution video source to a display monitor. You can use the S-Video AND Composite Video simultaneously. Video signals can be distributed up to more than 300~1000 feet away. Perfect for Classrooms, Training, Conference Halls, Retail outlets. It works great at high resolutions.