Feature: 1. Invisible IR Light: Infrared flashlights are not intended for general lighting purposes. It emits invisible, high powered infrared light at 850NM. And infrared light is invisible to the human eyes. 2. Use Suggestion: Infrared flashlight needs to be used together with professional night vision equipment to see more clearly, suitable for night vision goggles, monocular, infrared light camera and other matching use. 3. Durable Housing Material: Infrared flashlight is made of aluminum alloy material shell, waterproof, shockproof and slip resistant, easy to carry and suitable for night activities. 4. Scalable Length and Adjustable Focus: Infrared LED flashlight can achieve zoom function by telescopic flashlight, that is, long and short distance fill light. Light filling range is about 100 to 200 meters. 5. Wide Range of Uses: Infrared flashlight has high efficiency, low thermal resistance, can be used in camping, night fishing, night navigation, cave and other occasions to improve night vision. Specification: Item Type: Infrared FlashlightStretch Size: Approx.100 x 25mm/3.9 x 1in (Body length x Head diameter)Shrink Size: Approx. 94 x 25mm/3.7 x 1in (Body length x Head diameter) Power Supply Battery: 1 AA battery (not included) Light Source: IR red light (invisible to the naked eye) Wavelength: 850nm Material: Aluminum alloy. Package List: 1 x Infrared Flashlight