Topeak Mega 10-Watt White lite (2.8X1.8X2.8-Inch) Super high power 10W LED Compact aluminum lamp housing features integrated, mode color illuminated RISC controller button. Weight 138g. 3.7V Lithium Ion powerpack mounts to stem. Luminous intensity-10W-900,5W-450 or 10W-720 LUX,5W-180 LUX Rubber strap system makes installatio and removal simple. Includes carry bag, charger, and helmet mount. 2 lighting levels plus reserve for longer run times. Burn time 10W-3hr/5W-6hr/blinking 20hr