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One of the biggest productivity boosters you can add to any post-PC device is a keyboard. While on-screen keyboards are great for tapping out a tweet or email, they just aren't up to the challenge of typing out reams of material.
Add a keyboard and your smartphone or tablet becomes a true content creation machine!
My personal favorite keyboard for iDevices is the Apple Wireless keyboard. (CNET best keyboards). It's expensive, but it's reasonably slim for easy transportation, very ergonomic, tough (unusual for an Apple product), and very comfortable to type on for long periods.
Price: Depends on what you go for.
If you spend a lot of time in your car -- like I do -- you need a way to keep your portable devices charged up while you're on the move. While chargers for smartphones such as the iPhone are plentiful, good chargers that output the 2.1A needed by tablets such as the iPad are harder to find.
Currently I'm using a dual USB-port Just Mobile Highway Pro that keeps my iPhone and iPad charged up. It's a little pricey at around $30, but it's one of the most reliable charger I've come across so far – and I should know because I've bought a lot over the years.
Price: Around $30.
(Source: Just Mobile)
Call clarity is taken care of by the military-grade NoiseAssassin 4.0 noise-cancellation and wind reduction technology. The advanced array wideband speaker allows you to listen privately to music, podcasts, YouTube videos, sports, phone calls, Skype calls, and more, all in full-spectrum, high-definition quality sound.