Kramer Electronics 123VXL is a high performance line amplifier for composite or SDI video signals. It includes controls and circuitry to compensate for signal losses and noise inherent in long cable runs. High Bandwidth - 425MHz (- 3dB). Differential Circuitry - Reduce noise and hum found in long cable runs. Level (Gain) and EQ (Peaking) Controls. Looping Inputs. Selectable Input Signal Termination. Compact Size - Part of the Kramer TOOLS family of compact, high quality and cost effective solutions.