UltraFire 501B SUPER Bright CREE XM-L T6 LED 1000 Lumens 3.7-18V Tactical Flashlight Torch + Battery + Charger Set UltraFire 501B SUPER Bright CREE XM-L T6 LED 1000 Lumens 3.7-18V Tactical Flashlight Torch The body of this flashlight is built of high quality aluminum alloy Excellent waterproof, suitable for outdoor environment, adverse weather conditions Hard-Anodized finish; Anti-abrasive, free-scratch, shock-proof. Power by : 1x 18650 3.7v/ 2x 16340 3.6v