[. . . ] These limits are designed to provide reasonable protection against harmful interference in a residential installation. [. . . ] €¢ Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. €¢ Consult the dealer or an experienced radio or television technician for help. Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by Hewlett-Packard Company may void the user’s authority to operate the equipment. Declaration of Conformity for products Marked with FCC Logo, United States Only This device complies with Part 15 of the FCC Rules. 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. If you have questions about the product that are not related to this declaration, write to: Hewlett-Packard Company P. [. . . ] Com/go/reach Perchlorate Material - special handling may apply This calculator’s Memory Backup battery may contain perchlorate and may require special handling when recycled or disposed in California. [. . . ]