The TC4-25X+ from Mini Circuits is a Balun with Frequency 500 MHz to 2.5 GHz, Insertion Loss 0.37 to 1.59 dB, Current 30 mA, Power 0.25 W, Return Loss 6.09 to 22.67 dB. Tags: Surface Mount, Balanced to Balanced. More details for TC4-25X+ can be seen below.