A Sales Letter, Building Security is a document used by a building security company to promote its products and services. It typically outlines the benefits of a security system and attempts to persuade the reader to purchase the products or services. It includes details about the company, its products, and the features of the security system, as well as the cost and any other relevant information. Sales Letters, Building Security can be written for a variety of audiences, including homeowners, businesses, and property managers. The most common types of Sales Letters, Building Security are cold emails, direct mailers, and door-to-door flyers.