The MLFR-0204 from Micro Lambda Wireless, Inc. is a Band Stop Filter with Stopband Frequency 2 to 4 GHz, Insertion Loss 1.5 dB, Power 1 W(30 dBm), VSWR 2.0:1, Phase Linearity +/- 3 MHz. Tags: Module with Connectors. More details for MLFR-0204 can be seen below.