The company's review system does not allow me to choose less than 2 stars. The company deserves only half star. The product has Poor quality. The supercapacitors I bought and received lose electric charge and the voltage dropped within 1 minute after charge. The solar panel I received did not charge capacitors. The seller has Poor customer service. Even worse, after I entered a poor product review on their website, the site responded that my review will be "moderated", and I could not enter another review for other products I bought. I will never buy from this Chinese company again.