This is a power adapter for Raspberry Pi 3B/ 3B+, the charging port is Micro USB. With this adapter, you do not need to power the Raspberry Pi with a PC anymore. It also comes with a switch on the adapter, makes it convenient to control its power supply during the process of preliminary debugging.
Specifications
Input: 100-240V/ 0.3A, AC
Output: 5V/ 3A DC
Power plug: EU/ US/ UK/ AU
Charging port: Micro USB
Package list
Raspberry Pi 3B+ Power Adapter Micro USB with Switch Button x 1