The QSS NFNM AB 00 from NexTek, LLC. is a RF Surge Protector with Frequency 2 to 2.5 GHz, Input Power 0.5 kW, Insertion Loss 0.05 to 0.1 dB, Operating Temperature -40 to 90 Degree C, Return Loss 23.1 to 32.3 dB. Tags: Quarter-Wave Shorting Stub (QWS). More details for QSS NFNM AB 00 can be seen below.