The TCM4-19+ from Mini Circuits is a Balun with Frequency 10 MHz to 1.9 GHz, Insertion Loss 0.99 to 2.99 dB, Current 30 mA, Power 0.25 W, Return Loss 7.01 to 19.98 dB. Tags: Surface Mount, Balanced to Balanced. More details for TCM4-19+ can be seen below.