The QSS TFTF 04 00 from NexTek, LLC. is a RF Surge Protector with Frequency 2.4 to 6 GHz, Input Power 0.13 kW, Insertion Loss 0.15 to 0.2 dB, Operating Temperature -40 to 90 Degree C, Return Loss 23.2 to 32.5 dB. Tags: Quarter-Wave Shorting Stub (QWS). More details for QSS TFTF 04 00 can be seen below.