(1)Mode memory function: if the flashlight is turned on more than 3seconds ,current mode can be memoried.Turn it off and then turn it on ,still the original mode. if less than 3seconds ,Turn it off and then turn it on ,it goes into the next mode.
(2)Low voltage protection function: when the voltage of battery is 2.9-3.1V,the flashlight flashes 2times/sec with low brightness,it's a low voltage alarm.
(3)Battery reverse protection:if your battery is reversed,dont worry ,no any problem will happen.
Following are photos of last M2 version
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