The FLL21-900 from Sirius Microwave is a Low Pass RF Filter with Frequency 0 to 700 MHz, Stopband Frequency 1.02 to 10 GHz, 3 dB Cutoff Frequency 910 MHz, Insertion Loss 0.8 dB, Rejection 60 dB. Tags: Module with Connector, Lumped Component Filter. More details for FLL21-900 can be seen below.