Specification: Material:Aluminum alloy. LED:Luminus sst40 6500 K white shade. Low voltage warning:Yes. Reverse polarity protection:Yes. Lens type:Ar-coated glass lens. Reflector:Smooth. Memory mode:Yes. Driver:4 modes (0.1% -3% -30% -100%). Max power output:5000mA. Height:118mm. Width:24.1mm. Weight:76g. Package Included: 1 x S2+ SST40 LEDFlashlight. 1 x Lanyard. Driver instructions:(4modes) Now we offer another driver version, which has a simple 4 modes for switching, which is very suitable for ordinary users. modes: 0.1%-3%-30%-100%max current output is 5000mA. Its biggest advantage is that no frequency can be seen in any mode, and there is temperature management. It can control the flashlighttemperature not to exceed 55 degrees Celsius. If the flashlight temperature is below 55 degrees Celsius, it will output full current. If it is above 55 degrees Celsius, it will constantly adjust the current so that the flashlight will not overheat.