NiteRider HeadTrip Plus 6V

"These multi-purpose light systems are perfect for any situation. The HeadTrip Plus provides 3-, 6-, 10- and 15-watts of output from a single 15-watt Halogen bulb, so you can adjust your light to get the right runtime, there's even a 10-step fuel gauge with low battery warning and a 15-min 6-watt reserve so you'll know exactly when you need to head home. Includes Commuter safety flasher, Walking mode, SOS and beacon modes to keep you safe not matter what comes your way(includes 2.5-hr international charger. "