The WVR-1880B-56.2M01 from Wevercomm is a Band Stop Filter with Stopband Frequency 1.853 to 1.907 GHz, Bandwidth 54.8 MHz, Insertion Loss 2 dB, Rejection 40 dB Min @ 1852.6MHz to 1907.4MHz, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for WVR-1880B-56.2M01 can be seen below.