The BD2425J50100AHF from Anaren Inc is a Balun with Frequency 2.4 to 2.5 GHz, Amplitude Balance ± 0.5 dB, Phase Balance 5 Degree, Insertion Loss 0.75 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD2425J50100AHF can be seen below.