Better Business Bureau is warning consumers to be extremely cautious when answering the door to traveling alarm system salespersons. BBB received more than 4,221 complaints against burglar alarm companies in 2011, a 21 percent increase over the previous year. Already this year, many BBBs have issued warnings to locals regarding door-to-door alarm salesmen making the rounds. Every summer alarm salesmen hit the pavement and every summer BBB receives a rash of complaints from consumers who feel they were ripped off. Even if the salesperson claims it’s a limited offer and they must act now, consumers must always stop and do their research before purchasing any products or services. BBB offers the following advice for consumers on how to avoid becoming a victim of a deceptive door-to-door alarm salesperson: Deal only with reputable firms and check out the company at the Better Business Bureau’s Web site, www.bbb.org. Don’t be pressured into buying something you don’t want or need. Some companies will offer a “free” alarm system. While the equipment and installation may be free (make sure this is in writing), there is a monthly monitoring fee. When you compare costs, make sure you compare all the costs. Study the contract carefully. Make sure it includes all promises made by the sales person. If the promises are not in the contract do not sign the contract. For more advice on keeping your home and personal property safe, visit www.bbb.org