Night Knight / Sneaker Whistle

Night Knight, a sneaker whistle, provide the night joggers a sense of security.
The driver would receive a prompt, when you are running at night, its positive reflective coating can reflect the light from the vehicle in the opposite direction.
Once you encounter criminals, you can be pulled out the whistle above the base and blow the whistle, then the passers-by around you will pay attention to your help because of the high frequency of whistler. The base sounds, too. Meanwhile, the information of your call for help could be transmitted to the nearest security personnel through the wireless network of the base.