There has to be something exemplary about a “Pro” device, especially to justify the $170 price compared to the $100 you pay for the Backbone One. If you judge it merely by its on paper feature set, there’s not so much that stands out. The new mobile controller has a pair of back buttons on both the left and right grips. Not exciting enough? The Backbone Pro also houses a special pairing button for connecting to external devices—mainly PC, Mac, or TV—over Bluetooth. You can combine it...

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