"You may cancel this purchase for any reason, at any time within 30 days after the date of delivery of the hearing aid. To cover the costs of dispensing the hearing aid, the seller may withhold from the refund 10 percent of the purchase price or the seller's actual costs up to 20 percent of the purchase price."
"Notice of Cancellation
You may cancel this purchase of a hearing aid within 30 days from the date of delivery of the hearing aid.
If you decide to cancel this contract:
The seller may not attempt to obtain a waiver of your rights to cancel."
"Cancellation entitles you to a refund of all money you paid, less (choose either 10 percent or the actual cost to the seller as provided in this section), within 30 days after you return the hearing aid to the seller."
"Cancellation entitles you to a refund of all money you paid, less (choose either 10 percent or the actual cost to the seller as provided in this section). The seller must initiate a request for the refund from the selling institution's accounting department within 10 days after you return the hearing aid to the seller."
"Cancellation entitles you to a refund of all money you paid less (choose either 10 percent or the actual cost to the seller as provided in this section) within 30 days after the seller receives your notice of cancellation."
Md. Code, CL § 14-2503