The Wall Adapter Power Supply - 5V DC, 2A (USB) is a high-quality switching AC to DC "wall wart" that will do 5 V at 2 A! This wall adapter regulates the output to 5 V.
It has a standard USB-A connector for the output so you can power your Arduino, Raspberry Pi, etc. through a USB cable. Any device that uses a USB cable for charging or power can be powered with this supply.