Lit up by dipping in water; Response fast;
No dry battery nor lead nor lithium battery, safe and environmental friendly;
Could be activated by any kind of water; Even human urine can be used when emergent;
Can be stored for 5-10 years without losing performance under vacuum/sealed condition.
How to use:
Dip half of the light in water for 15s;
When light dims, dip again.
Emergency lighting (in military affairs, outdoor travels, disaster rescue, indoor balckout, etc.); First aid kit; Education.