The 0866BL15C200 from Johanson Technology is a Balun with Frequency 800 to 900 MHz, Amplitude Balance 1.0 dB, Phase Balance 10 Degree, Insertion Loss 1.2 dB, Power 3 W. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 0866BL15C200 can be seen below.