Brand Name: GeRuiLaite High-concerned chemical: none Origin: Mainland China Light Source: LED bulbs Model Number: M600 Ultra Scout Light Flashlight SF Color: Black/Dark Earth Length: 3.62 inches(126mm) Bazel Diameter: 0.98 inches(25mm) Weight: 7.05 ounces(200g) Material: Hard Anodizing Aluminum Rail Type: 20mm rail Max Output: 400 lumens Tactical Runtime: 1.5 hours Battery type: 2 pieces 3V CR123A or 16340 (not included) Output: Constant and Momentary(with tail) Choice: yes semi_Choice: yes