Only imply that your QS-9000 or ISO 9000 certification is for your quality system. It is not a product certification. If your company has more than one location, be certain to indicate which sites are certified.
Certification is site-specific.
Always follow the procedures provided by your registrar when using accreditation marks. Each country has its own set of rules for using its mark. It's a good idea to have your registrar review your plans for using accreditation marks before you use them. Now it's time to let your customers and the rest of the world know about your accomplishment. This communication is essential because you probably began the whole certification process in response to market or customer demand in the first place.