USB Power Boost 5V to 9V Adapter
✅USB cable USB to DC5.5 * 2.1mm charging cable power supply cable hole 9V boost lines USB cable
✅PowerBank to power other devices. Such as: Routers, USB lights, USB fan, radiator, 5V mini speakers, and so on ...
✅DC power plug size: diameter: 5.5mm, inner diameter: 2.1mm; positive with 1 meter cable length