The Micro-Lux Turbo is one of the smallest most powerful single LED, single battery 10440 (AAA) sized flashlight that we know of in commercial production today and like all the TnC products is superbly finished and built like a bank vault solid and dependable. The Micro-Lux Turbo uses the new XM-L2 LED and is a 3 tier output level, with memory mode direct drive flashlight. They are offered in Electroless Nickel Aluminum, Brass, Copper, Stainless Steel and Titanium. The unit produces about 750+ lumens on the turbo setting with a smooth on/off twist head operation. The maximum power is produced from an IMR 10440, but a standard 10440 will also work, these torches will not work with an alkaline AAA 1.5 volt battery. The settings are as follows: Turbo-100%: Medium-30%: Low-5%. The unit will step down to a lower setting when the battery needs to be recharged. The flashlight has a length of about 3 inches and a head diameter of 0.850 inches, the battery tube diameter is 0.6 inch. A split ring is included so you can mount the flashlight on your keychain if you want. The weight with the battery is from 1.1 oz. to 2.6 oz. this depends in your choice of metal. Price does not include batteries or a charger, and must be purchased separately.