HP 3-Button PS/2 Optical Scroll Mouse (Silver) HP 3-Button PS/2 Optical Scroll Mouse General Features: Silver color 3-buttons Scroll Wheel (acts as third button) PS/2 interface Optical technology 70-inch cable length, approximate Power Rating: 5V == 70 mA Regulatory Approvals: FCC CE CSA C-Tick BSMI MIC TUV/GS