The BLK-V54+ from Mini Circuits is a DC Block with Frequency 0.01 to 50 GHz, Insertion Loss 0.41 to 1.25 dB, Breakdown Voltage 100 V, Input Power (Avg) 30 dBm, Return Loss 12.2 to 23 dB. Tags: Connectorized, Inner DC Block. More details for BLK-V54+ can be seen below.