The DFS0503R1561P010 from Zhejiang Jiakang Electronics is a Band Pass Filter with Frequency 1.556 to 1.566 GHz, Bandwidth 10 MHz, Center Frequency 1561 MHz, Insertion Loss 1 dB, Rejection 20 dB. Tags: Surface Mount. More details for DFS0503R1561P010 can be seen below.