The CAK-DF-DF from Xiamen HDG Telecom Equipments is a In Series RF Adapter with Frequency DC to 3 GHz, Contact Resistance 1 to 1.5 mOhms, Insulation Resistance 1000 MOhms, Mating Cycles 500 Cycles, PIM -155 dBc. More details for CAK-DF-DF can be seen below.