The Sprinter 500 headlamp is a high-end solution for runners who start early in the morning or finish late at night. Extremely bright with a maximum output of 500 lumens, it provides you with optimal nighttime visibility. It's easily turned on and off with the push of a single button. The power is adjustable in two ways: by PowerTap for quick adjustment on the run, and by variable dimming for precise adjustment. Already very light thanks to its breathable, perforated elastic headband, the top strap can also be removed if you wish. When racing at night, being seen by others is also important, so the Sprinter 500 has reflective logos and a flashing red light on the back. As for its power supply, you can use the rechargeable BD 1800 lithium-ion battery that comes with the headlamp, or you can also use AAA alkaline batteries. Technical specifications: Maximum intensity: 500 lumensTwo types of power: 3 AAA alkaline batteries (included) or BD 1800 rechargeable lithium-ion battery (included)Micro-USB port included on rear battery compartment for quick chargingPowerTap technology: allows you to quickly switch from full intensity to modulated intensityRed strobe tail light with programmable on/off for increased visibility3 LED indicator and six settingsLocking mode: ensures that it does not light up in the bagIPX4 weatherproof, rain and snow resistantPerforated elastic headband with removable top strap Battery life: 2 hours at full power Headlamp Black Diamond ---Sprinter 500 Ultra Blue