Dell OptiPlex 160L - Manual (Page 58)

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 nonbusiness-purpose device.
MIC Class A Regulatory Label
If the regulatory label includes the following marking, your computer is a Class A product:
Class B Device
Please note that this device has been approved for nonbusiness purposes and may be used in any environment, including residential areas.
MIC Class B Regulatory Label
If the regulatory label includes the following marking, your computer is a Class B product:
Polish Center for Testing and Certification Notice
The equipment should draw power from a socket with an attached protection circuit (a 3-prong socket). All equipment that works together (computer, monitor,
printer, and so on) should have the same power supply source.