[. . . ] Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. [. . . ] It is important that you use Apple peripheral devices and shielded cables and connectors between system components to reduce the possibility of causing interference to radios, TV sets, and other electronic devices. You can obtain Apple peripheral devices and the proper shielded cables and connectors through an Apple Authorized Reseller. for non-Apple peripheral devices , contact the manufacturer or dealer for assistance. This computer equipment generates, uses, and can radiate radio-frequency energy. If it is not installed and used properly--that is, in strict accordance with Apple's instructions--it may cause interference with radio and TV reception. This equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the specifications in Part 15 of FCC rules. These specifications are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. [. . . ] (That is, make certain the computer and the TV or radio are on circuits controlled by different circuit breakers or fuses. [. . . ]