The HP 907703-601 is a system board for the HP ProBook 450 G4, intended for a compatible laptop repair or board replacement. The parts listing identifies it as the UMA configuration with an Intel Core i5-7200U processor.
This part is specified for the Windows (“WIN”) configuration. Matching the board number and configuration helps identify the right system board for the stated ProBook model. The listing describes it as a motherboard assembly, rather than a standalone processor or an external accessory.