NiteCore SmartPD D10 LED Flashlight 130 Lumens Piston Drive Unique Infinitely Variable Digitally-controlled Brightness System. Switch reliability is greatly increased over traditional switches. Electronically controlled switching. When the light is off, the microprocessor draws very, very little power Extremely compact size and lightweight suitable for Every Day Carry (EDC). As with all NiteCore products, made from tough, imported 7075 military-grade aluminum!