The 2701 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 52.5 MHz, Stopband Frequency 200 MHz, 3 dB Cutoff Frequency 52.5 MHz, Lower Rejection 50 dB@200 MHz, Upper Rejection 3 dB@200 MHz. Tags: Plug In. More details for 2701 can be seen below.