The AM433S819 from Anatech Electronics is a Band Pass Filter with Frequency 433.44 to 434.39 MHz, Bandwidth 0.95 MHz, Center Frequency 433.92 MHz, Insertion Loss 3 to 4 dB, Upper Rejection 45 dB 412.52 - 423.22 MHz. Tags: Surface Mount, RF SAW Filter. More details for AM433S819 can be seen below.