The TUSX-DFM from PolyPhaser is a RF Surge Protector with Frequency 300 MHz to 1.2 GHz, Input Power 1 W, Insertion Loss 0.1 dB, Operating Temperature -50 to 85 Degree C, Storage Temperature -50 to 85 Degree C. Tags: Filter. More details for TUSX-DFM can be seen below.