The SB-2811 is a 4 input to 4 output Composite BNC Video Distribution Amplifier (booster) used to drive signals over a long distance. This product provides signal amplification from +0db to +6db via an adjustable control. This is useful for distributing high resolution video signals to a display monitor from up to 300 to 1000 ft away. For proper amplification, make sure that your video source is closely located to the amplifier and connected with a short cable. Perfect for classrooms, training, conference halls, and retail outlets. Surface mount tabs are provided