Solar speaker
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Just find this cool product. In 2016 they was collecting money on kickstarter to make it.
Since that time they already sell it on amazon.
129$
www.amazon.com/MacroBoom-Waterproof-Bluetooth-Speakers-RoamProof/dp/B01MY2FXXF
-water proof
-dust proof
-shock/drop proof
-15h battery life
https://www.roamproof.com/macroboom-use-care/
Hunter: 
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