The City Rover 610 is a USB rechargeable headlight with a powerful lithium-ion battery and a darkness destroying CREE LED bulb. It's a real bright 610 lumens! Its precision reflector provides superior luminous guidance for up to 10 hours of ride time. The Lars Rover will run for an additional 15 minutes in low power safety mode after the low battery indicator light comes on. The rugged alloy construction is weatherproof and strong enough to handle the abuse of an urban commute.