The TCM4-452X+ from Mini Circuits is a Balun with Frequency 20 MHz to 4.5 GHz, Phase Balance 0.01 to 0.89 dB, Insertion Loss 1.44 to 1.82 dB, Current 30 mA, Power 0.4 W. Tags: Surface Mount, Balanced to Balanced. More details for TCM4-452X+ can be seen below.