PRESIDIUM Synthetic Ruby Identifier User Handbook Manual page 15

If an external power source is used, plug the provided micro USB
cable to the port located at the back of the device (Fig 1.2) and the
other end to the provided Presidium Universal Power Adaptor for
connection to an external power socket.
Fig.1.2 Plug the micro USB into the port located
at the back of the device
You may also connect the other end of the USB cable directly to an
external power source (e.g. computer, laptop, etc).
It is recommended you use only the USB cable and the Presidium
Universal Power Adaptor provided with your product.
13