Natalie orders a new IPAD from Big Mark Electronics, Inc. which ships the IPAD to Natalies address in Utah.

Along with the box carrying the IPAD, the box contains an agreement setting forth the terms of the sale, including what remedies are available if Natalie disputes the IPAD or the IPAD has problems.

The agreement inside the box states that Natalies retention of the IPAD for longer than 90 days will be construed as an acceptance. The terms of the agreement include terms of the warranty, remedies, and other issues associated with the product.

What type of agreement is this called?