This is a high quality 'wall wart' AC to DC 5V 2000mA USB Micro-B wall power supply. These are switch mode power supplies which mean the output is regulated to 5V and the capable output current is much higher (2000mA).
These wall adapters are perfect for supplying power to many single-board computers like the the Raspberry Pi but NOT the Raspberry Pi 3 or 3 B+, you will need a higher grade wall adapter like a 5.1V DC 2.5A version for that. Please note, this specific supply (5V/2A) is also FCC/CE certified and works with 100-240VAC inputs.
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