If you purchased your Anglepoise 90 Mini Mini lamp in the UK or Europe, it is supplied with a USB-A to Micro-USB cable and mains adapter plug that can be plugged in to the wall.
If you purchased your 90 Mini Mini lamp in the USA before September 2019, it is supplied with a USB-A to Micro-USB cable only. An adapter plug is included in if you purchased your lamp after September 2019.
You can use third party USB-A adapter plugs to power the lamp, as well as USB-A power sources such as portable batteries and laptops.
The lamp has a Micro-USB input socket on the base.