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This USB to DC Cable boosts 5V mobile voltage to 9/12V to power optical modems, wireless routers or other devices. With DC 3.5/DC 5.5 Interface:DC3.5mm (3.5mm outer diameter, 1.35mm inner diameter), DC5.5mm (5.5mm outer diameter, 2.1mm inner diameter),For different device charging needs. Digital Display Voltage detection: With real-time voltage detection, the displayed value is the voltage value after boosting, lcd digital display, easy to view. Adjustable: The boost voltage can be adjusted by pushing a button to 5V/12V to meet the power supply requirements of different devices. This USB to DC Cable is compact, portable, easy to use and powerful, and is a good choice for you.