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This is a 5V power adapter that can provide 4000mA continuous current output. The DC5.5*2.1 power output connector is perfectly compatible with the Arduino master controller and can provide stable power supply. For some projects that require motors or servo systems, USB 5V cannot provide enough power. Excessive power supply voltage may cause potential overheating problems. This adapter can just meet your needs. It can not only provide appropriate power, but also avoid heating. And it provides a DC2.1 to Micro USB adapter, which can be used as a power supply for Raspberry Pi 3B and various Micro USB interface development boards.
