The DFS0403R2492P040 from Zhejiang Jiakang Electronics is a Band Pass Filter with Frequency 2.472 to 2.512 GHz, Bandwidth 40 MHz, Center Frequency 2492 MHz, Insertion Loss 1 to 2 dB, Rejection 20 to 30 dB. Tags: Surface Mount. More details for DFS0403R2492P040 can be seen below.