DetailsAn ultra-thin, well balanced USB-rechargeable headlamp that also runs on standard AAA batteries, the 275-lumen Black Diamond Sprinter 275 is purpose-built for longer distance pre-dawn/post-sunset runs that require the reassurance of longer battery life. The light's updated optical efficiency provides a balanced beam with brighter light, and you can easily track battery life with a six-setting, three-LED batter meter. The Brightness Memory feature allows you to turn the light on and off at a chosen brightness without reverting back to a default setting, and the Sprinter 275's PowerTap™ Technology makes for instant brightness adjustment settings. The light's perforated elastic headband is designed for improved breathability while running, excellent front/back balance and a red taillight strobe in the rear adds visibility in urban areas but can be turned off when you're on the trails. Now running on a new modular BD 1800 rechargeable battery, the Sprinter 275 is modular, accepting either the rechargeable battery or standard AAA alkalines. In addition, a stormproof design keeps the Sprinter 275 going strong in any weather with regulation for constant illumination throughout the battery life.