I had something like this a while back for my iphone http://http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogI d_10151_productId_762017_langI d_-1_categoryId_254705 worked really well, had 3 or 4 quickset buttons to change the frequency incase of interference and it kept the phone charged up on the go too

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