EVOLVA FUTURE TECHNOLOGY LT38 IR Infrared Flashlight IR Night Vision Torch Light with Osram Olson Black 940nm LED- Infrared Light is Invisible to Human Eyes - to be Used with Night Vision Device INVISIBLE IR LIGHT: Evolva LT38 is NOT a regular flashlight with white LED for general lighting purpose. Utilizing Osram Oslon infrared light black 940nm LED emitter, Evolva LT38 emits invisible but high power IR light with more than one watt of optical power. Please beware that: you wont see any light with your bare eyes. This high performance IR illuminator is designed to be used with night vision devices, such as monocular and goggles. LONG RANGE ILLUMINATION: Evolva LT38 utilizes the Osram Oslon infrared light black 940nm LED - todays smallest and most advanced infrared LED with high efficiency, low thermal resistance, and more than one watt of optical power. LT38 can produce a powerful punch with approximately 150 meters range (approx. 164 yards) with focused beam. With the latest chip technology, integrated lens and an excellent package, lifetimes of up to 50,000 hours are easily obtainable. ASPERICAL LENS: 38MM Lens rotary focusing function enable the ability to focus in for a tight spotlight or back out for a flood effect, especially designed for long range illuminations. LT38 can illuminate much farther with focused beam, compared with illuminator without focusing functions. CAN ONLY BE POWERED BY 2 x 18650 BATTERIES: With operating voltage of 7.4 - 8.4V, LT38 is powered by 2 x 18650 Li-Lon rechargeable battery. Please carefully select the 18650 with genuine core as there are many 18650 batteries on the market with fake cores and of inadequate quality. Some fake 18650 battery has an output voltage lower than 3.7V which will not be sufficient to power up Evolva LT38. SOLID BODY AND MODE MEMORY: Body made of Aircraft Aluminum Alloy. Housing Diameter: 1 inch (25.4mm).Fit with any 1 inch (25.4mm) ring and mount. Net Weight: 234g.Length:212mm. 3 Mode System from Low-Mid-High with mode memory (LT38 remembers and turns on to the last setting that it is operated on).