Official Raspberry Pi Power Supply-(US) Black, UL 5.1V; 1 Output; Plug In Power Supply; 2.5A
by Raspberry Pi
Official Micro USB Power Supply for Raspberry Pi 3 Model B - US Plug
This is the official Raspberry Pi MIcro USB power supply from Raspberry Pi, for use in the United States.
Important: Compatible with Boards that use Micro USB Ports ONLY.
NOT compatible with the Pi 4