Meet the React Sidekick: a tiny gadget that can help you get out of trouble. It bypasses your phone’s screen lock to send an alert when you need help. You can use it to alert your contacts using e-mail, text, or social networking sites. The Sidekick is compatible with iOS and Android devices. It has a range of 50 feet. The battery life lasts more than a year (battery is user replaceable).
The React Sidekick lets you share your location with your friends in real-time. You can wear it around conveniently. More information is available here.