In case anyone missed it:
https://www.ecfr.gov/cgi-bin/text-id...0_121&rgn=div8
Operant wording:
(f) Signal booster labeling requirements.
(1) Signal booster manufacturers, distributors, and retailers must ensure that all signal boosters marketed on or after March 1, 2014 include the following advisories:
(i) In on-line, point-of-sale marketing materials,
(ii) In any print or on-line owner's manual and installation instructions,
(iii) On the outside packaging of the device, and
(iv) On a label affixed to the device:
(A) For Consumer Signal Boosters:
(1) This is a CONSUMER device.
BEFORE USE, you MUST REGISTER THIS DEVICE with your wireless provider and have your provider's consent. Most wireless providers consent to the use of signal boosters. Some providers may not consent to the use of this device on their network. If you are unsure, contact your provider.
You MUST operate this device with approved antennas and cables as specified by the manufacturer. Antennas MUST be installed at least 20 cm (8 inches) from any person.
You MUST cease operating this device immediately if requested by the FCC or a licensed wireless service provider.
WARNING. E911 location information may not be provided or may be inaccurate for calls served by using this device.
Translation: registration is a requirement (US), Code of Federal Regulations (CFR). Again, virtually unenforceable and I'll go out on a limb to say nobody cares. But I could be wrong.