Power banks with solar panels are becoming more and more common. Some of them seem to charge extremely fast under the sun, others much slower. Sadly this power bank from Yokkao, while otherwise a good device, is one of the slower-charging ones. Leaving it out all day in the sun never seemed to charge it by more than 20%, which isn't even enough to charge my Samsung Galaxy one time. However, it works very well when charging by USB, so use the solar power as more of a back up, then you're good to go.

Aside from the weak solar charging, this power bank is quite good. It's well padded to resist fall-damage, and it's water resistant against small splashes or light rain, but it is NOT waterproof, and should never be submerged. It can be charged via USB, and you can use the two ports to charge two devices at one time. Charging my phone with this gave me very good speed, and I was able to charge my phone twice from 0% on one full charge.

This power bank has a loop at the top which can be used to tie it onto something, and it comes with a hook in case you want to attach it to your bag or your clothes. It also has a flashlight, but it's not extremely bright, but would still be useful in an emergency.

Overall this power bank is a good option if you plan to travel and want something that's versatile and lightweight.

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Pros
+ Shockproof, water resistant
+ Can charge two devices at once
+ Solar charging allows for use outdoors
+ Small and designed to be portable
+ Sturdy and durable.

Cons
- Solar charging is painfully slow
- Water resistance is very limited
- Flashlight is very weak

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Note: I received this product at a discounted rate in exchange for an unbiased, honest review as provided here. As a consumer advocate, I believe in providing quality and honest feedback and receiving a product at a discounted rate will never affect my opinions.