The 2920-400 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 387.5 to 412.5 kHz, Bandwidth 25 KHz, Center Frequency 400 kHz, Insertion Loss 3 dB, Rejection 60 dB. Tags: Module with Connectors, Lumped Component Filter. More details for 2920-400 can be seen below.