The 2450BM15B0009 from Johanson Technology is a Balun with Frequency 2.4 to 2.5 GHz, Phase Balance 10 Degree, Insertion Loss 1.5 dB, Return Loss 9.5 dB. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 2450BM15B0009 can be seen below.