The QSS NFNF AK 00 from NexTek, LLC. is a RF Surge Protector with Frequency 411 to 494 MHz, Input Power 0.75 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 NFNF AK 00 can be seen below.