The HP 645156-001 is a slim AC adapter for compatible HP notebooks. It has a 120 W rating and RC, V and PFC designations, with a 3-wire configuration.
HP lists it for computer models with an Intel processor, including the EliteBook 8560w. Its slim format suits use as a replacement power adapter in a compatible setup.
Regional 3-pin power cords are listed separately from the adapter in the HP guide, so a cord is not confirmed as included.