The SRFBT-1GI1G-WFB8 from Suntsu Electronics Inc is a Balun with Frequency 2400 to 2500 MHz, Amplitude Balance 2.3 dB, Phase Balance 162 to 198 Degrees, Common Mode Rejection 25 dB, Insertion Loss 1.6 to 1.8 dB. Tags: Ceramic, Surface Mount, Balanced to Unbalanced. More details for SRFBT-1GI1G-WFB8 can be seen below.