Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC: This device is labeled with an FCC ID number. If this label is not visible when installed in an end device, the outside of the device MUST also display a label referring to the enclosed module. Wording on the label similar to the following shall be used: This device contains transmitter module FCC ID AZPFX-FM72.