The Meteor Auto X front generates up to 450 lumens of light from its 1 Cree XML U2 LED. A built in safety mode means that once the USB (Universal Serial Bus) rechargeable battery level falls below predefined level, this selects the brightest mode that guarantees 1 hour run time to get you home. The memory mode function ensure that when you turn you light back on, it returns to the last selected mode The double shot daytime flash mode provides an ultra-bright option combined with exceptional run times ideal for standing out during the day & night The integrated light sensor means the light can be set to auto mode which means the light will turn & off automatically