The HF-ERF Series from Pole/Zero is a Tunable Filter with Frequency 1.5 to 30 MHz, Bandwidth 0.855 to 1.14 MHz, Insertion Loss 5 to 7.5 dB, Supply Voltage 4.75 to 5.25 V, Operating Temperature -40 to 85 Degree C. Tags: Surface Mount, Digitally Controlled. More details for HF-ERF Series can be seen below.