This is a EU patented product.Patent number is: 002689562-0002 Product Description:The T20 IR (Night Hunter Series) is an infrared light night vision torch suitable for night vision devices using an 850nm wavelength. The T20 is an high power LED torch with adjustable focus especially designed for hunting.Lamp base: Osram Black IR 850nm. With a lifespan of up to 100，000 hours or more， no need to consider replacing the cap for the whole life.Operation Instruction :On/Off Operation:Hard press the tail switch until it clicks (Complete press) to activate the torch.Hard press(Complete press) gain until it click to turn the light off.  Specification :Model: UF-T20LED:Osram Black IR 850nmMaterial: Aircraft aluminum alloy Battery:1 x 18650 rechargeable battery(without battery)Batteries Input voltage: 3.7-4.2V Lens: 38mm Aspherical Lens Waterproof: Splash proof onlyDimension: Bezel diameter 45mm， body diameter 25mm， Overall length 147.5mm Weight: 170gOperation Temperature: -25 degrees Celsius up to 50 degrees Celsius The perfect IR illuminator for your Night Vision needs:Armasight Drone Pro Yukon PhotonPulsar N550/750NiteSite NS50/200 Viper-Wolf Ward D visionDIY night vision   Package:1x Flashlight