It is important, whether during your warm-up or sales presentation, or when talking about your security system, that you are able to read as much as you can about your prospects and what their reactions are to what you are saying at any given moment.
The importance of this review is primarily to have you reflect upon how closely you watch for body language and consider how it can direct your actions.
Examples
of positive signals:
"Success is getting what you want;
happiness is wanting what you get."