HP invent 355386-001 Manuale Utente

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Hardware Guide
External Device Connections
Connecting a USB Device
USB (Universal Serial Bus) is a hardware interface that can be 
used to connect external devices such as a USB keyboard, mouse, 
drive, printer, scanner, or hub to the notebook. A hub is a 
connecting device that can be either powered or unpowered.
Optional USB hubs can be connected to a USB connector on 
the notebook or on an optional HP Notebook Expansion Base, or 
to other USB devices. Hubs can support several USB devices.
Powered hubs must be connected to external power.
Unpowered hubs must be connected either to a USB 
connector on the notebook or to a port on a powered hub.
The USB connectors support USB 2.0 and earlier devices.
Some USB devices might require additional support software, 
which is usually included with the device. For more information 
and software installation instructions, refer to the documentation 
included with the device.
Identifying the two USB connectors on the left side and the one USB 
connector on the right side