The USB charging is a good idea, and two batteries are always useful. Unfortunately the cable connection on the charger broke and now it will only make connection to charge if I prop it at just the right angle. So now I have to invest in another charger. ---Update. OAproda stood by its product, informing me a a three year warranty and replacing the charger and batteries. It may be that I just had a defective sample. In any event, the company service was outstanding and I am updating my rating. I still think that USB charging is a good idea. 5 volt USB charging stations are found everywhere, all over the world. Thank you OAproda
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