** A competitor is now leaving fake reviews on this light. There are 5 written reviews but 13 global ratings and we do not sell it globally. The foreign companies selling these lights are ruthless. If you doubt, then read what they say about it falling off and not being bright and purchase the item to see what a lie this is. Please come back and leave an honest review once you see the kind of scoundrels these people are** This is the perfect accessory for a gun you keep close to the bed in case you hear something that goes bump in the night. The unit is lightweight yet very sturdy, being constructed from the highest quality aircraft grade anodized aluminum. Super Bright High quality Cree XP-G LED. Steady on or Strobe modes with continuous steady run time of 2 hours (120 minutes) Operated with a single CR123A lithium battery (included). DC/DC voltage regulation circuit included. Universal Fit-Quick release mount fits most compact and full size rails. You will not be disappointed in the quality of this light's construction or the brightness of it's light. Do not be fooled by all the claims of 400 or 500 lumens with runtimes of 3 or 4 hours. These are simply made up numbers. If you see anything burning beyond 2 hours of continuous run time, then the light is not bright enough. If you do have a light running at 400 lumens, your run time is only going to be around 30 minutes per battery. The optimum brightness vs battery life in a tactical flashlight is 2 hours at 250 lumens. If you are reading something different from this, then the company advertising it is simply making up the numbers, knowing that most people do not know the difference. DO NOT pay excessive amounts for a light simply because of false advertising where bigger is brighter and better.