The NCR2-123+ from Mini Circuits is a Balun with Frequency Up to 18 GHz, Amplitude Balance ± 0.02 to 2.89 dB, Phase Balance 0.34 to 11.89 Degree, Insertion Loss 0.03 to 0.56 dB, Power 3 W. Tags: Ceramic, Unbalanced to Balanced. More details for NCR2-123+ can be seen below.