The TTMO-4-1A+ from Mini Circuits is a Balun with Frequency 0.1 to 300 MHz, Insertion Loss 0.28 to 1.56 dB, Current 30 mA, Power 0.25 W, Return Loss 1.90 to 32.56 dB. Tags: Plug In, Unbalanced to Balanced. More details for TTMO-4-1A+ can be seen below.