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Belkin 10-port USB power charger
Chances are that the Kindle Fire HDX will be one of many devices that you have that need charging from a USB port. If you have a lot of devices, then this Belkin 10-port USB power charger may be just what you need.
For those with fewer devices, there is also a 4-port version available.
Sennheiser PMX 685i headphones
Despite the Kindle Fire HDX having an awesome set of speakers, sometimes you just want to listen to something in peace or in private.
I've been through literally hundreds of headphones over the years and the Sennheiser PMX 685i are my favorites. Not only are they rugged and sweatproof – ideal for the gym – but they are comfortable and give out great sound.