This Light Up Safety Shoe Clip Set easily attaches to the heel of most running shoes. 2 LED light mode options: steady or flashing. Lightweight and secure. Perfect for running, walking, biking, and other outdoor activities. Includes two red LED lights and 2 replaceable CR2016 button cell batteries. The product attaches onto the back of your shoe securely. It is easy to attach but hard to fall off. It has a spiky texture at each end where it holds onto your shoe, giving it a stronger grip. Assorted lighting colors for options and customized logo imprinting is available.