I bought this product mainly for the compass. I own many USB chargers and this charger has LED flashlights (pretty bright) and a small compass as well as two USB ports for charging electronics. CAUTION: the instructions in the manual state this charger cannot support all-in-one data cables to charge multiple devices. It says do not use one. This charger charges by sunlight, supposedly, but I have not tested this . Please read the instructions. The instructions were all over the place. It' stated in the product's description that the batteries in the charger are "high-density lithium polymer batteries," but it also gives a WARNING in the product booklet/leaflet that, "This product contains lithium-ion batteries." Which does it contain, lithium polymer, lithium-ion, or both type batteries? I looked up the differences in the batteries, so they are different types. I almost returned this product based on the Precautions section of the product's booklet/leaflet: "Do not drop or use this product in high temperature, humid, strong magnetic environment." It has solar panels for charging by sunlight. It states in the product's description that it's waterproof-why can't the charger be dropped in water or be in humid areas? There is what appears to be a waterproof cap covering the USB ports. "Do not place foreign objects such as metal onto the wireless charging area to avoid danger" There is no wireless charging area. If there is one, mine does not work and I should get this product replaced. "Do not leave this product in the car, the closed high temperature environment will cause damage to this product." The purpose of the solar charging is to be placed in the sunlight. I guess it's best to place it in sunlight when it's cold not hot or humid as in the summer. "This product has a built-in over-temperature protection function. When the ambient temperature exceeds the normal use temperature range, over-temperature protection may occur. At this time, just move the product to the normal use temperature environment and click the button to restore the output." Too much going on here. Is the product safe to use in high-temperature environments or not? No, I will not intentionally attempt to use this charger on a day over 75 degrees and you obviously cannot sit it in direct sunlight on a hot or humid day. Under the solar charging instructions in the booklet/leaflet, the instructions states, "Under the sunshine (avoid high temperature) or strong light environment, the solar power bank can charge itself without operation, and the solar-charging indicator light to turn green and steady lighting. Please charging the power bank with adapter when it under the self-protection mode that cannot be used or turned on." All quotations are typed verbatim from product's manual. I am going to use this for the compass because I specifically bought it when I saw the compass. I thought the product was larger, but it's smaller than I expected-fits in my hand 6 to 6.25 inch hand. The best parts about this product so far are that the LEDs are bright, the charger was fully charged when I received it, there is a waterproof cap, but I am concerned that getting this product wet will cause the internal batteries to swell and spoil the product. It may be worth the $19.99 spent, or it may be an overall dud, too. I am leery if the charging is actually 36800 mAh; I am suspicious that this may be an ok but not an excellent product. I wish to return later to say better things about this product as I use it more. UPDATE: image included