The 2.4/1.85-JK from Talent Microwave Inc is a Between Series RF Adapter with Frequency DC to 50 GHz, Insertion Loss 0.35 dB, Insulation Resistance 5000 MOhms, Temperature -55 to 165 Degree C, Voltage Rating 1000 V. More details for 2.4/1.85-JK can be seen below.