USB charging device photorealisticavailable with or without the Hamster.
Since the Universal Serial Bus specification provides for a five-volt power supply (with limited maximum power), it is possible to use a USB cable to connect a device to a power supply. Products based on this approach include chargers for cellular phones, portable digital audio players, and tablet computers. They may be fully compliant USB peripheral devices adhering to USB power discipline, or uncontrolled in the manner of USB decorations.