When the crew you came with disperses into the crowd, the LynQ Tracker can help you find find them again. It’s a sort of digital compass that uses GPS to guide you back to your people. Up to 12 of these devices can be linked together. It doesn’t need a cellular connection or data to track locations and has a range of about 5 miles, which could come in handy for festivals, hikes, and other outdoor adventures. Battery life: 3 days. These devices will be available this summer.