N.C. Gen. Stat. § 93D-7
Statements of sale.
§ 93D-7. Statements of sale.
Every person fitting and selling a hearing aid, be it new or used, in the State of North Carolina, at or before the time of delivery of the hearing aid shall render to the user and/or purchaser a statement of sale to include the following:
(1) Date of delivery
(2) Condition of hearing aid; new, used, reconditioned
(3) Hearing aid identification number
(4) Name of manufacturer
(5) Price of hearing aid
(6) Charge for fitting and service
(7) Name of dealer and/or fitter
(8) Signature of customer.