Briefly explain some common used attention-getting devices used in sales messages.

Answers will vary. Various techniques have been successful in convincing readers to consider an unsolicited sales message. Regardless of the technique used, the attention-getter should achieve several important objectives: introduce a relationship, focus on a central selling feature, and use an original approach.
Some commonly used attention-getting devices include:
a. A personal experience: When a doctor gives you instructions, how often have you thought, "I wish you had time to explain" or "I wish I knew more about medical matters"?
b. A solution to a problem (outstanding feature/benefit): Imagine creating a customized multimedia presentation that …
c. A startling announcement: More teens die as a result of suicide each month than die in auto accidents in the same time period.
d. A what-if opening: What if I told you there is a savings plan that will enable you to retire three years earlier?
e. A question: Why should you invest in a company that has lost money for six straight years?
f. A story: Here's a typical day in the life of a manager who uses an iPad.
g. A proverb or quote from a famous person: Vince Lombardi, one of the most successful coaches in the history of football, once said, "If winning isn't everything, why do they keep score?" At Winning Edge, we specialize in making you the winner you were born to be.
h. A split sentence: Sandy beaches, turquoise water, and warm breezes … it's all awaiting you on your Mesa cruise.
i. An analogy: Like a good neighbor, State Farm is there.
Other attention-getters include a gift, an offer, a bargain, or a comment on an enclosed product sample.