Gravastar is back again with another exclusive giveaway for KnowTechie readers. For the next few weeks, we're running a giveaway for the next few weeks where we’ll select three winners (yes, three!) to receive a pair of the company's highly-rated Sirius Pro earbuds, courtesy of GravaStar. Each pair of earbuds run in the ballpark of $149, which means this giveaway has a total value of $430. Yup, that’s right, you can win any of these one-of-a-kind earbuds just by simply throwing your name in a hat. Seriously, it’s that easy. The giveaway will run from July 18 to August 15. Three winners will be selected and announced on August 16. Entries are limited to readers based in the U.S.