The T4-1-2W-KK81+ from Mini Circuits is a Balun with Frequency 10 to 250 MHz, Insertion Loss 0.26 to 0.42 dB, Current 30 mA, Power 2 W, Return Loss 13.08 to 29.62 dB. Tags: Surface Mount, Balanced to Balanced. More details for T4-1-2W-KK81+ can be seen below.