2:10 XM-L U2 VS XM-L T6
The Ultrafire 668 come with the AAA Battery Holder，18650 Battery Holder and Wall Charge. Overall size and weight is larger, heavier than other lights with built-in18650 charging features.
A useful feature is that the Ultrafire 668 has the ability to charge. The charging dock uses a standard DC pin-style connector, under a white rubber cover. Unlike some competing products, the cover plug is attached to the light, so you don't have to worry about losing it.
Now the Ultrafire 668 offers two different types of battery power.
You have one 18650 battery which you can put in flashlight with the 18650 battery holder.
And you could put 3 AAA batteries in this, and just slide that in and then put on the cap.
High Medium Low SOS Strobe. In repeating sequence.
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