This document defines the communication of Power Source Devices within the Universal Serial Bus (USB)
protocol as a Human Interface Device (HID).
Various devices can have integrated hardware power control of internal components and/or batteries. The
same functionality can also be associated with devices powered from external power sources, such as
uninterruptible power supplies (UPS). In either case, status and control communication within the USB
protocol is desirable for energy conservation, reset, and/or system shutdown.
