The T4-2-KK81+ from Mini Circuits is a Balun with Frequency 0.2 to 600 MHz, Insertion Loss 0.62 to 1.66 dB, Current 30 mA, Power 0.25 W, Return Loss 2.16 to 21.14 dB. Tags: Surface Mount, Unbalanced to Unbalanced. More details for T4-2-KK81+ can be seen below.