There are a number of devices that parents can buy to prevent their children from hearing objectionable language while they watch television. ProtecTV is the only product of its kind that has an expandable dictionary. Parents can add words and phrases they find offensive, and the additional words will be deleted from soundtracks and captioning. ProtecTV uses a(n) strategy.

Product Differentiation

Explanation:

Product Differentiation is the market strategy employed by an organization whereby a unique, marked characteristic difference is introduced in their product or services in order to gain competitive advantages over competitors in the same niche of business.

The introduction of distinct differences such prices, quality or services covered makes the product more attractive to a particular target market and ensures unique selling proposition of the product.

From this question, ProtecTV is the only product of its kind that has an expandable dictionary among other products where parents can prevent their children from hearing objectionable language while they watch television.