The BFCN-4440 from Mini Circuits is a Space Qualified RF Filter with Frequency 4.2 to 4.7 GHz, Center Frequency 4440 MHz, Stop Band Frequency 2000 to 12000 MHz, Bandwidth 500 MHz, Power 1.5 W. Tags: Surface Mount. More details for BFCN-4440 can be seen below.