Source: U.S. imports CREE Q5 LED 250 lumens Material : aluminum alloy , three anodizing , tail button switch The range of : more than 500 meters ( all aluminum smooth optical glass ) Stall mode : flash of light - light - low light - burst -SOS Shell color : titanium or black Battery: 2 18650 lithium-ion battery Specifications : 235mmX55mmX30mm