The HRMA-CF- 2-4 from HRmicrowave is a Band Pass Filter with Frequency 2 to 4 GHz, Insertion Loss 1.5 dB, Upper Rejection 50 dB, Lower Rejection 60 dB, Return Loss 15 dB. Tags: Module with Connectors, Combline Filter. More details for HRMA-CF- 2-4 can be seen below.