Power Source: USB rechargeable Li-ion. If you get the product and it shows a red light. Please hold the button until the light turns blue so you can start using it.
FEATURES of the NiteRider Lumina 750 Boost Bike Light New boost mode, double click power button to unleash maximum LED output 5 Light levels plus 1 daylight flash mode Cree LED at 6000k FL1 Standard IP64, dust and water resistant Affordable, super high output light at 750 lumens on boost mode Easy on and off handlebar strap mount with quick release tab Fits standard and oversize 35mm handlebars Perfect for helmet mounting IntelliCharge-reduce charge time in half Convenient USB rechargeable Low battery indicator Lock mode, perfect for use during storage and transporting the light Press and hold power button for 7 seconds to lock out operation of light