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Dual charging port: dual USB charging, supports charging of mobile phones, tablets, and car appliances. It can be installed and used in cars with working voltage of 12V-24V. High power output: 5V/1A+5V/2.1A, to achieve fast charging efficiency Safety Features: Built with ABS plastic and includes an on/off power switch for enhanced energy savings and equipment protection. Wiring instructions: The red wire is connected to the positive pole of the power supply, and the black wire is connected to the negative pole of the power supply. Versatile Compatibility: Easy to install in most 12-24V DC vehicles, including cars, boats, SUVs, ATVs, RVs, trucks, and motorcycles.