The 2450BM15B0003 from Johanson Technology is a Balun with Frequency 2.4 to 2.5 GHz, Phase Balance 12 Degree, Insertion Loss 2.2dB, Power 2 W, Return Loss 10 dB. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 2450BM15B0003 can be seen below.