HP 674315-001 is a PS/2 optical mouse for controlling a computer through a PS/2 connection. HP’s parts catalog identifies this exact part number as the PS2 optical mouse.
Optical tracking supports everyday pointer movement and selecting items, while the scroll wheel lets you move through documents and pages. The description for this same part number confirms both features.
This is specifically the PS/2 model. HP lists its USB optical and wireless mice as separate variants, so 674315-001 distinguishes this mouse from those versions.