Also save your bill of sale, as it may be required for warranty service. CAUTION: Please ensure that the correct plug is used on your AC outlet. CLEANING - Unplug the AR subwoofer from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. ATTACHMENTS - Do not place the AR Subwoofer on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing serious injury to a child or adult, and serious damage to the product. The