[. . . ] This warranty covers defects in materials and workmanship of Commercial Products manufactured, sold or certified by Plantronics which were purchased and used in the United States and Canada. [. . . ] We may use functionally equivalent reconditioned/ refurbished/remanufactured/pre-owned or new Products or parts. If you need additional information, please contact our service centers at the numbers provided. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state or province to province. Please contact your dealer or our service center for the full details of our limited warranty, including items not covered by this limited warranty. For your comfort, health, and safety, please do not exceed moderate listening levels. It is usually located on the back of your computer and has 3 or 4 jacks in a row that are color coded and/or identified with speaker or microphone graphics (see illustration). [. . . ] Step 3: Insert the headset plug with the into the sound card jack that has the headphone icon or "speaker out" above it. [. . . ]