This is a Partner Tech part number 2902712120009 - PNT replacement DC power cable. The cable features a DC jack with a 5.5mm outer diameter and a 2.0mm inner diameter. It is 1.5 meters in length and comes in black color, designed for use with compatible Partner Tech devices.
2902712120009 - Partner Tech PNT, CABLE/DC JACK/5.5X2/1.5M/ BLACK/GP