Here is a bike light that gives your ride balls. Bike Balls attaches to your bicycle seat rail and keeps you visible. The ball sack sways and emits a bright red glow as you ride your bicycle .You can change light modes with a gentle squeeze. These balls are water/splash resistant.
Bike Balls keeps you visible and might put a smile on people’s faces as they watch you ride away. Firebox has these for under $30.