Seriously, buy this. Buy it even if you don't really need it. It's really fun to plug into my phone and write something. I'm pretty reckless, so I also use this keyboard on my phone to answer emails, text messages, and type web searches. I had to sit down at a coffee shop or restaurant in between meetings to write or do small work assignments, but for the first time I can remember really sitting back in the amazing knowledge that I was able to look out for everyone replying to messages and email, and writing everything to my little heart in about 1/4 the time I thought it would take. In turn, I was able to actually relax in my remaining free time instead of anxiously checking the time between tasks to rush off at the last moment. By the way, I also connected this to my Apple TV and sometimes to my iMac. It's not designed for ultra-fast and smooth transitions between paired devices, but the process is so simple it only takes a few minutes. It's more of a novelty, I've found that after a few months I've rarely used it with anything other than my phone, but you can do it.
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