The QAM4M4 from Qualwave is a In Series RF Adapter with Frequency DC to 0.3 GHz, Contact Resistance 1 to 3 mOhms (Outer) / 2 to 3 mOhms (Center), Mating Cycles 500 Cycles, Temperature -45 to 125 Degree C, Voltage Rating 3000 V (RMS). More details for QAM4M4 can be seen below.