Featuresr 3 ultra bright leds produce high brightness light and great visibility making your cycling safer at nightr include 4 lighting modes steady mode 4hrs run time fast flashing 5 6hrs run time slow flashing 5 6hrs run time and breathing mode about 10hrs run timer usb rechargeable bicycle taillight easy to charge the light from your computer or any device with a usb port only takes 2 hours to fully charger the light shell is made of high strength abs material anti scratch