The QALCN from Qualwave is a Between Series RF Adapter with Contact Resistance 0.25 mOhms(Outer), 1 mOhms(Center), Frequency DC to 4 GHz, Mating Cycles 500 Cycles, Temperature -45 to 125 Degree C, Voltage Rating 3500 V (RMS). More details for QALCN can be seen below.