If it is FCC Verification, there must be warnings on the nameplate and instructions:

When using the verification method, the product must have the following label: Label format (verification)

The label must include model number (for example: Model. No. 123), company's name or trade name, and country of origin information. According to U.S. Customs and Federal Trade Commission regulations, all products manufactured outside the United States must be labeled with the country of origin. Under no circumstances can the FCC ID number appear on the label of a product that is certified.

The label or product manual should have relevant similar descriptions:

This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference . (Applicable to radio broadcast receiving devices such as Part 73 radio broadcast equipment)

This device is verified to comply with Part 15 of the FCC Rules for use with cable television service. (Applicable to cables and its connector, etc.)

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. (All other equipment)

Note: If the equipment consists of two or more parts connected by wires, the above label should be affixed to the main on the control unit. If the device is too small to bear the above statement, it must be reflected in the device packaging or instructions.