Portland Design Works' City Rover 500 USB Headlight is a rechargeable headlight with a powerful lithium-ion battery and a bright Cree LED bulb ready to illuminate the darkness on your commute or evening road ride. Its precision reflector provides superior luminous guidance to the front and side for up to 2 hours on high, 8 hours on low, or 36 hours in flash mode. In case of a low battery, the City Rover will run for an additional 15 minutes in low power safety mode after the low battery indicator light comes on. The lumens and burn times are FL1-certified, and the light uses a Texas Instruments circuit for longevity.