It's a simple Brake Lamp for bicycle.
Just tie on seat-post or hang on your backpack with transparent plastic bag.
This simple thing will help you at night when you forgot bring your back light.
- Putting screen should can see your backside.
- Screen will Max-Brightness with stop sign when braking.
- It's Just for emergency use.
- Depends on your device, sensitivity may different.
Launch.
9Apps 4.9
