The AE821NS2168 from Anatech Electronics is a Band Stop Filter with Stopband Frequency 818.5 to 823.5 MHz, Bandwidth 5 MHz, Insertion Loss 1 dB, Rejection 40 dB, Power 0.4 W. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for AE821NS2168 can be seen below.