Meet the Revolar: a compact wearable device that lets you get help when you do not feel safe outside. You can wear it in a discreet fashion. All you need to do is input your emergency contacts on the Revolar app and press the button to get help. This Bluetooth device lasts for months.
The Revolar is compatible with iOS and Android devices. It lets you send a help message with location information to your loved ones quickly. You can find out more about it on Kickstarter.