NiteRider Evolution Smart 6V Halogen Headlight

"A light system with high power and intelligent controls made for the avid cyclist. The ultra-bright 15W halogen bulb can be set to four different levels (3W, 6W,10W and full power 15W). The digital fuel gauge gives you a real-time view of how much runtime you have remaining. Lightweight NiMH battery is small enough to fit in your jersey pocket and can even be mounted to your frame. System includes handlebar and helmet mounts and 2.5 hr charger. Wt.: 550g."