The SA-NKK-1-3G-SQ from Xiamen HDG Telecom Equipments is a RF Surge Protector with Frequency DC to 3 GHz, Insertion Loss 0.16 dB, Operating Temperature -40 to 85 Degree C, Surge Current 20KA(8/20 µs). More details for SA-NKK-1-3G-SQ can be seen below.