[. . . ] With the combination of dynamic neodymium speakers, a fold down subwoofer, and 3D sound processor, your PSP experience will not be complete without it. [. . . ] This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one or more of the following measures: · Connect the equipment into an outlet on a circuit different form that to which the receiver is connected. Caution: Any changes or modifications not expressly approved by the guarantee of this device could void the users authority to operate the equipment. Philips warrants that this product shall be free from defects in material, workmanship and assembly, under normal use, in accordance with the specifications and warnings, for one year from the date of your purchase of this product. [. . . ] For Technical Support send an email with the model number of the product and a detailed description of your problem to: Email: accessorysupport@philips. [. . . ]