will this device work on my iphone 4s I play alot of golf and use GPS apps. my phone is constantly on during a 4.5 hour round

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    Absolutely. This thing will charge just about any USB device. Every Apple device is covered because while this product wasn't made specifically for the Apple stuff, they were certainly the driving force behind its creation. Most people say they can get 3 full charges on their iPhone using this unit. I just bought it and haven't yet used it but I can tell you that from all the research I've done you're in good hands with this guy!

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