Topeak WhiteLite HP 3-Watt Bicycle Light 3W LED Bicycle Light CR123A Lithium Battery x 2 Optional - 5V 4400 mAh Lithium Ion powerpack 3W-2.5 hrs/ 1W-6 hrs/Blinking- 10hrs 30 / 60 / 120 Minutes 120 g / 0.26 lb (light only)