The AUTHOR DOPPIO 40lm is the ideal addition to your bike for riding on busy city roads. With its bright 40 lumens output you'll spot dangers well in advance plus you'll stand out to oncoming traffic. It also features side lens cutouts, which provide you with a 180-degree light beam and increases your visibility to other road users. Highly practical, the DOPPIO 40 features power indicator LEDs built in switcher. Compact and lightweight, water resistant. Adjustable tool free bracket with silicon strap for diameter 15 –35mm even the unround profiles. 2x LED - output brightness 40 lm. Charging LED built in switcher – Red LED = charging / Green LED = full charged . Low battery cut off function. Recomended discharging / charging period – minimum 1x / 6 months. Charging cable included (USB A / Micro-B). 300 mAh built in lithium-ion battery. Run time: 8h / high power; 12h / 50% power; 10h / flashing. ↓↓↓# light rechargeable # USBwhere to buyaccessoriestechnical specificationphotogallerydownloadproduct optionsaccessories Technical specificationRun timeHigh beam up to 8 hr. Low beam up to 12 hr. Flashing up to 10 hr.BatteriesRechargeable lithium-ion battery 300 mAh.OthersUSB A / Micro-B. Low battery indicator. Battery charging indicator. Photogallery Download charging [ pdf, 454 kB ] Product options black24"-28" = UA#12002262 accessoriesAUTHOR Bracket ACC-X5Universal bracket for the lights Author A-Duplex X7, A-Square USB CobLed, A-Pilot CobLed USB 50 lm, A-Doppio 40 lm.