Illustration for TIME by Harry Campbell
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Stephen Lee, 23, is already sold. He says his Helio's Buddy Beacon came in handy one night when his roommate went out. "I saw that she was at Wendy's, and I just texted her to pick up a couple of 99ยข crispy-chicken sandwiches," says the graduate student in Chattanooga, Tenn. "I really use it to show other people that it's cool and they should get one." So far he has convinced his roommate, his girlfriend and his best friend. Well, it's a start.