The CER0839B from CTS Electronic Components is a Band Pass Filter with Frequency 2.3 to 2.4 GHz, Bandwidth 100 MHz, Insertion Loss Less than 1.8 dB, Rejection 40 to 48 dB, Power 2 to 20 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CER0839B can be seen below.