HP 827035-001 Power Button Board is a spare part for the power button function in compatible HP ProBook notebooks. It is identified as a board rather than a complete computer or power adapter.
The listed compatible models are the HP ProBook 450 G3, 455 G3 and 470 G3. This model-specific fit makes the part relevant when servicing the power button assembly in one of those notebooks.
The listing specifies one board. It does not confirm whether a cable or other accessories are included.