ZebraLight SC51 200 Lumen AA LED Flashlight Battery: One 1.5V AA (NiMH, lithium or alkaline). Comes with two lithium batteries. Output: 200/100 lumens on high, 30/8 lumens on medium, 2.5/ 0.2 lumens on low Runtimes: 0.9/2.4 on high, 12/39 hours on medium, 3/16 DAYS on low Durable natural hard anodized finish (Type III Class I) Can be used as a headlamp with the included headband