Meet the GEKO Smart Whistle: a smart whistle with GPS and Bluetooth that helps you get out of trouble in case of an emergency. You just have to blow it or press for 2 seconds to activate emergency texts, e-mails, and calls. The whistle updates your location every 3 minutes until you deactivate the alert.
Such a device could prove useful for runners, cyclists, and anyone else spending time outside. It supports continuous location tracking Google Maps. Costs under $50 at this time.