16 CFR §239.2

1. (a)If an advertisement mentions a warranty or guarantee that is offered on the advertised product, the advertisement should disclose, with such clarity and prominence as will be noticed and understood by prospective purchasers, that prior to sale, at the place where the product is sold, prospective purchasers can see the written warranty or guarantee for complete details of the warranty coverage. 1
2. (b)If an advertisement in any catalogue, or in any other solicitation 2 for mail order sales or for telephone order sales mentions a warranty or guarantee that is offered on the advertised product, the advertisement should disclose, with such clarity and prominence as will be noticed and understood by prospective purchasers, that prospective purchasers can obtain complete details of the written warranty or guarantee free from the seller upon specific written request or from the catalogue or other solicitation (whichever is applicable).