The DEA102450BT-1278A2 from TDK is a Band Pass Filter with Frequency 2.4 to 2.5 GHz, Bandwidth 100 MHz, Center Frequency 2.45 GHz, Insertion Loss 2.36 to 3 dB, Rejection 12 to 35 dB. Tags: Surface Mount. More details for DEA102450BT-1278A2 can be seen below.