1. The Helmet Light is With the Latest Specific Uses for the Helmet Mounting, Widely Used in Military and Outdoor Adventure .MFG and Various Types of Ground Operations.2. Functions Include: Visible LED Light + IR + White Flash Light, Can Provlde Flashling or Constant Light. Color: Green Light+IR / Red Light+IR/Blue Light +IR. *Attention: IR Lights are Invisible and Shallow Lights, Need to use Night Vision Device to Fully Display.3. High-quality ABS Material, IP67 Waterproof Grade. Low Temperature Resistance, When You Need Rescue in an Outdoor Adventure, Your Tactical Helmet Lights Can Better Assist You in Requesting Support, and it Can Also be Used for IFF.4. Installation of Battery: Open the Battery Cover, Insert 1pcs CR123A (Not include). Put on the Battery Cover and Tighten the Fixing Screws Clockwise.