This emergency light requires no battery and claims to run for up to 140 hours, with a shelf life of 5 years.

All you need to do is add salt water!

The packaging even claims that it can run on seawater or urine, without adding additional salt. Although in my testing, it was not able to turn on with just urine.

Note: in this video I used the phrase 'sacrificial anode'. It's probably more accurate to say 'consumable anode'.

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