The 1905A-1 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 11.33 to 14.53 kHz, Bandwidth 3.2 KHz, Center Frequency 12.93 kHz, Insertion Loss 1 dB, Rejection 40 dB. Tags: PCB Mount, Surface Mount, Lumped Component Filter. More details for 1905A-1 can be seen below.