EN System Requirements: PC Mac Windows® 98SE, Windows® ME, Windows® 2000, Windows® XP, Windows® Vista™, or Windows® 7 Mac OS9/OS® X, or later Certified USB controller Built-in USB connection Installation: Ensure that the Notebook Speakers is installed properly before using. Never unplug the USB plug while the Notebook Speakers is playing sound. 1 Unfold the Notebook Speakers and adjust the length of the retractable cable (Fig. 1). 2 Connect the USB cable to a USB port of your computer (Fig. 2).