You are a remarkably fortunate individual. That's because you have found SDT equipment. All of these items tie together as a specific subsection of Vanguard, and they have similar features and a dependable performance level. Look through the Vanguard SDT equipment we have below, and if you have issues tell us. Our product specialists can help you work out if SDT products are perfect for you, or if another Vanguard series could be a better fit. If you're wondering about quality, check out our Vanguard Reviews. They were written by customers like you and give useful insights. And don't forget that most purchases greater than $29.95 get free shipping!