Amazon has today announced a raft of new features, which include expandable storage, that are headed to its Fire TV box and streaming sticks. When the over-the-air update rolls out, these devices will also gain support for wireless Bluetooth headphones and a new more secure PIN entry screen to keep them secure – and to ensure that your kids can’t see the PIN as you type it in. There will also be a few new shortcuts to make operation a little easier, like pressing and holding the Home button to enable display mirroring. Amazon said it has also put together “hundreds of expertly…

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