$149 including shipping cost in Aliexpress
BT40 is close to MJ872, but i think it is looks better than MJ872.
1. The LED indicator are not alway ON, it is waste electricity. BT40 only the light ON, then the LED indicator ON;
2.Press 0.8 seconds to OFF since the hot surface;
3. Package also include helmet mount;
4. Better gift box and foam...
It is also come with four BAK A standard 18650 batteries, 7.4V 4400mAh;
Current 1.4A, four XP-G R5 LED;
Including 1.8A charger;
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