The Z7550-FFNM+ from Mini Circuits is a Balun with Frequency DC to 2.3 GHz, Insertion Loss 0.02 to 0.55 dB, Current 5000 mA, VSWR 50 omhs: 1.09:1 to 1.50:1, 75 ?: 1.03:1 to 1.51:1. Tags: Module with Connectors, Unbalanced to Unbalanced. More details for Z7550-FFNM+ can be seen below.