The EQN0520-04 from Eclipse MDI is a Gain Equalizer with Frequency 500 MHz to 2 GHz, Gain Equalization 4 dB, Insertion Loss 0.75 dB, Power 21.76 dBm, Impedance 50 Ohms. Tags: Module with Connectors, Positive Gain Slope. More details for EQN0520-04 can be seen below.