The QSSTJTPO400 from NexTek, LLC. is a RF Surge Protector with Frequency 1.45 to 1.7 GHz, Input Power 150 W, Insertion Loss 0.05 to 0.1 dB, Operating Temperature -40 to 90 Degree C, Operating Voltage 400 V. Tags: Quarter-Wave Shorting Stub (QWS). More details for QSSTJTPO400 can be seen below.