Kryptonite's Alley F-800 bike headlight is a must - have for commuters. It offers 6 different lighting modes, including Daytime and Nighttime Pulse for maximum visibility. Side illumination ports ensure you're clearly visible when crossing traffic lanes. The memory function turns the light on in the last mode it was turned off, and the power - saving function kicks in when the power drops to 10% or lower, automatically switching to a lower lumen output. It's fully USB rechargeable, so you never need to buy batteries again. The built - in battery indicator shows the charge level with colors: red for below 25%, yellow for 25% - 50%, and green for fully charged. With these useful features, you can focus on your ride, not your light. Specifications include a high steady mode of 800 lumens for 1.5 hours or 400 lumens for 3 hours runtime, and other modes with varying lumen outputs.

Using your Kryptonite Alley F - 800 headlight is easy. To turn it on, simply press the power button. You can cycle through the 6 different modes (High Steady, Medium Steady, Low Steady, Daytime Pulse, Nighttime Pulse, and Economic Flash) by pressing the button again. When the battery indicator shows red, it's time to charge the headlight. Just plug it into a USB port. For maintenance, keep the headlight clean by wiping it with a soft, dry cloth. Avoid using harsh chemicals. When storing, make sure the headlight is fully charged. And always remember, the power - saving function will activate when the power is at 10% or less, so don't be surprised if the light dims automatically.