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This 2-piece adapter cable comes with USB 2.0 A female to DC 3.5x1.35mm female port, specially designed for 5V small electronic power conversion. It realizes flexible switching between USB power port and DC barrel jack, plug and play without complicated setup. Made of durable wire and solid connector, it ensures stable current transmission and long service life. The compact 28cm length is suitable for desktop arrangement and concealed wiring, perfectly powering tablets, electronic dogs, access control and attendance equipment.