940nm IR Light Torch: ULTRAFIRE 501IR infrared torch is not a conventional flashlight with white LED light. Please note that the naked eye will not see any light, it will emit high-power 940nm invisible infrared light. Humans cannot see infrared light, recommended to use night vision goggles and goggles at the same time. A faint red glow appears on the LED, indicating that the flashlight is turned on. Stepless Dimming Infrared Torch: Just turn the switch to customize the brightness setting in the range of 5%-100%. The brightness transition is smooth, and there is no longer a preset brightness limit. You can choose the appropriate brightness output according to different environmental requirements, or you can set a very low brightness to achieve a longer running time. Adjustable Focus & Single Mode: Single mode for easy operation. The flashlight can zoom in and zoom out, Illuminate larger areas when zooming in, and illuminate farther distances when zooming in, and freely adjusting the focus. Sturdy & Waterproof: Made of top quality aluminum alloy with matte anodized surface, resistant to scratches, abrasion and corrosion. IPX4 waterproof, can be used in heavy rain. Small size fits in your pocket, backpack, easy to take it anywhere. Worry-Free: This product is a flashlight only. If you have any questions, please feel free to contact us. Providing our customers with high-quality products and services is our top priority.