The SF1000001 from Filtronetics is a Band Pass Filter with Frequency 999.15 to 1000.85 MHz, Bandwidth 1.7 MHz, Center Frequency 1000 MHz, Insertion Loss 3.9 to 5 dB, Rejection 30 to 44 dB. Tags: Surface Mount, RF SAW Filter. More details for SF1000001 can be seen below.