Dell Latitude LM - Manual (Page 115)

Regulatory Notices C-5
Class A Device
Please note that this device has been approved for business
purposes with regard to electromagnetic interference. If
you find that this device is not suitable for your use, you
may exchange it for a device that has been approved for
use in residential as well as business environments.
Class B Device
Please note that this device has been approved for non-
business purposes and may be used in any environment,
including residential areas.