The HT-RO-E3PM-DCP from PolyPhaser is a RF Surge Protector with Frequency 800 MHz to 2.5 GHz, Input Power 300 W, Insertion Loss 0.1 dB, Operating Temperature -55 to 85 Degree C, Operating Voltage 6 V. Tags: Gas Discharge Tube, Avalanche Diode, Metal Oxide Varistor. More details for HT-RO-E3PM-DCP can be seen below.