Olivetti MB-2 User Manual page 3

This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provided reasonable protection againt harmful
interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency and, if
not installed in accordance with the instruction manual, may cause harmful
interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in wich case the user will be required to correct the
interference at his own expense.