The NiteRider Lumina 1200 Boost Front Bike Light lets you operate your light at maximum light output of 1,200 lumens with a simple double-click of the button.Fits standard and oversize 35mm handlebars; easy on/off handlebar mount with quick-release tab.Compact and lightweight design is also perfect for helmet mounting (helmet mount not included).USB-rechargeable for convenient charging; IntelliCharge charges the battery twice as fast as the normal charge rate when connected to a higher-amp AC adapter.Lock mode prevents activation during storage and transportation; simply press and hold the power button for 7 sec..Low battery indicator.Charge Time: 3 hours.Battery Life on High: 1.5 hours.Battery Life on Low: 6 hours.Battery Life Flashing: 10 hours.Weight: 6 oz..