The HP-2R7-J308UMJ70 from Jinzhou Kaimei Power is a Supercapacitor with Capacitance 3000000 mF, Voltage Rating 2.7 V, Equivalent Series Resistance 0.29 mOhms, Temperature Operating Range -40 to 70 Degree C. Tags: Through Hole. More details for HP-2R7-J308UMJ70 can be seen below.