The OLP45-3 from Beijing Ocean Microwave Corporation is a Low Pass RF Filter with Frequency DC to 45 MHz, Insertion Loss 0.4 to 0.5 dB, Rejection 40 dB @ 90 MHz, 60 dB @ 122 to 1000 MHz, VSWR 1.23:1, 1.50:1, Return Loss 14 to 20 dB. Tags: Module with Connector, Chebyshev Filter. More details for OLP45-3 can be seen below.