The Z7550-NMNF+ from Mini Circuits is a Balun with Frequency DC to 2.3 GHz, Insertion Loss 0.01 to 0.40 dB, Current 5000 mA, VSWR 50 omhs: 1.07:1 to 1.51:1, 75 ?: 1.06:1 to 1.50:1. Tags: Module with Connectors, Unbalanced to Unbalanced. More details for Z7550-NMNF+ can be seen below.