YUNDU Solar Charger 1.2 W High Efficient Sunpower Panel with Dual USB 5000mah At the Same Time to Supply the Two Phones with Electricity (Black)

i like this product a lot. it does as advertised. charging two things at once is great. it has a internal battery and a battery led indicator so you know how much juice it has. the solar charging works in high or low lighting sunlight pretty well. i like that it came with a charging cord that provides a way to charge your phone or whatever and also with that same cord. you can manually charge the device.but there were a few things that i was hoping were better. one thing i was hoping to be better was you can not charge the internal battery by using sunlight so for a camping situation where you needed a light at night and the battery's juice is out it will not work even if it was exposed to sunlight all day. one other thing that i thought is worth mentioning if your are charging the device and you think you can also charge another device using the other usb ports on the device. it will not work that way. and one other thing i have noticed the device it's self takes a long time to charge the battery to it's full charge. but it does store quite a bit of energy. i tested this by running my phone on a high power consuming app with all my brightness on high. i let the phone run really low on power. then i plugged it into the charger while still using the app at the same time. and the device charged my phone up to full power at the normal rate of charging. also i repeat the same possess. and the YUNDU device still had some energy left over.as far as the shock proof i really don't know. i kinda do not want to test that but the device seams to be built well . and the water resistance. i would doubt that its waterproof because it's an electronic device however it would probably do well in the rain. but i would use the caps for the usb ports for extra protection just to be safe. i also bought one for my brother that does tile work as a living. i will update on his findings as well.