The NCS4-442+ from Mini Circuits is a Balun with Frequency 3.3 to 4.2 GHz, Amplitude Balance ± 0.01 to 0.50 dB, Phase Balance 0.16 to 8.83 Degree, Insertion Loss 0.28 dB, Power 3 W. Tags: Ceramic, Unbalanced to Balanced. More details for NCS4-442+ can be seen below.