SKYRAY King 3xCREE XML T6 6000 Lumen LED Flashlight 4x18650 Made of high quality 6061T aluminum alloy, this flashlight is sturdy and durable enough for long time daily using Super Bright, blinding Effect Crenellated strike bezel for enhanced self-defense Keep pressing the switch for 2 seconds can realize Strobe Mode You can use 2/3/4 18650 battery for different brightness.