Would it be chargeable using a USB-PD charger?

If not, how much wattage can it hold?

The user manual says that I should use the USB cable from the package.

It doesn't say about the power source specifically, but it contains a picture listing possible sources such as a laptop or xbox console.. and there's no picture of an independent charger.

I wonder if it means that I should charge it only via usb ports on such devices.

Thank you in advance!