"On all of these Power Bank designs, water or moisture is a concern, just like it would be with a mobile phone. I'm not sure how sensitive the circuit is on these torches if water gets into the connector."-Drew Stoiberg ,PW Optics
We have a IPX5 waterproof certificate, but not sure about this question,so we did a testing as bleow: open the USB cover and put it into the water. The result is it still work normally.
If you have more questiones, pls feel free to conatact POPPAS, " WITHOUT THE SUN, AS WE MOVE ON"