The ZXLF-K221+ from Mini Circuits is a Low Pass RF Filter with Frequency DC to 0.22 GHz, Stopband Frequency 570 MHz to 12 GHz, Insertion Loss 1.4 to 3 dB, Rejection 11 to 26 dB, Upper Rejection 11 to 26 dB @570 to 12000 MHz. Tags: Module with Connector, Reflectionless Filter. More details for ZXLF-K221+ can be seen below.