The JTX-4-10T+ from Mini Circuits is a Balun with Frequency 50 MHz to 1 GHz, Amplitude Balance ± 0 to 0.26 dB, Phase Balance 0.35 to 2.82 Degree, Insertion Loss 1.38 to 1.73 dB, Current 30 mA. Tags: Surface Mount, Unbalanced to Balanced. More details for JTX-4-10T+ can be seen below.