The 11-533-104 is a one input to four output composite video distribution amplifier with a loop-thru input (10K Ohm termination). The output of the loop-thru input must be terminated with a doenstream devices or a BNC terminator to 75 Ohms. This unit has a single gain pot controls the gain of all four outputs. Unused outputs do not need to be terminated with 75 Ohms. All of the video connections are BNC connectors. This unit is intended to be used with NTSC or PAL video signals.