Illuminate the path ahead and stay visible wherever your run takes you with the Nathan Nebula Fire Runner's Headlamp. With five brightness modes and three settings, the Nebula will help you see and be seen whether you're running through the forest or down city streets. Five modes offer varying levels of brightness, including a strobe mode that flashes at the brightest setting. From there you have three settings options. Manual control lets you cycle through the modes with the press of a button. Manual Auto Strobe still lets you cycle manually, but engages the strobe mode when activated by significant changes in ambient light, such as car headlights. The final setting is RunWave Auto Strobe, which lets you cycle through the modes with the simple wave of your hand in front of the headlamp so you never have to break your stride. Meanwhile, the Auto Strobe safety setting still kicks in whenever it sense changes in ambient light.