§ 427. Buyer's or other obligor's right to cancel. 1. In addition to
any right otherwise to revoke an offer, the buyer or other person
obligated for any part of the purchase price may cancel a door-to-door
sale until midnight of the third business day, or until midnight of the
seventh business day in the case of a door-to-door sale of a personal
emergency response service, after the day on which the buyer has signed
an agreement or offer to purchase relating to such sale.

2. Cancellation occurs when written notice of cancellation is given to
the seller.

3. Notice of cancellation, if given by mail, shall be deemed given
when deposited in a mailbox properly addressed and postage prepaid.

4. Notice of cancellation need not take the form prescribed and shall
be sufficient if it indicates the intention of the buyer not to be
bound.