Light Up LED Glowing Multi-Color Golf Balls8 Color Modes including Color Change!New Light Activation Technology!Use Your Cell Phone Flashlight to turn on and off!Instructions: Night Eagle LED Golf Balls use a new Light Technology to activate. Simply shine an LED Golf Ball Activator Light or Smart Phone Flashlight onto the printed activation circle to turn it on and to circulate through the 8 color modes. Shine the same light source onto the activation circle again to turn it off. Note: We have found that iPhone flashlights work the best compared to other smartphone brands.