DIY Dry battery operate LED lights

電的乾電池 LED 燈.
Energy saving dry battery operate LED lights are useful for rural area. 
適用範圍:
窮鄉僻壤無電供之處,賑災,緊急照明,定位等.
No electricty suppliy area, disaster relief, emergency, positioning etc.


這個更是可以 DIY 的.




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